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August 12, 2026
AR-15 Buffer Weight Chart: H1, H2, H3 & Gas Block Tuning

AR-15 gas system and buffer tuning guide with interactive calculators. Adjustable gas block setup, buffer weight chart (H1/H2/H3), ejection pattern diagnostics, and troubleshooting for suppressed and unsuppressed rifles.

Our Top Picks

  1. #1 VLTOR A5 Buffer Kit ($108): Best overall buffer system for toggling between suppressed and unsuppressed
  2. #2 Riflespeed Adjustable Gas Block ($210): Tool-free click adjustment with 12 detented positions for precision tuning
  3. #3 BRT EZtune Carbine Gas Tube ($64.95): Set-and-forget tuning for pinned gas blocks where AGBs aren't an option

Our Top Picks

1
VLTOR A5 Buffer Kit
Best overall buffer system for toggling between suppressed and unsuppressed
$108
2
Riflespeed Adjustable Gas Block
Tool-free click adjustment with 12 detented positions for precision tuning
$210
3
BRT EZtune Carbine Gas Tube
Set-and-forget tuning for pinned gas blocks where AGBs aren't an option
$64.95

Affiliate links (?)

[ < Back to guides ]
Reference guideGas tuningSuppressed ready

AR-15 Buffer Weight Chart: H1, H2, H3 & Gas Block Tuning

Balance dwell time, port sizing, and mass to keep AR-pattern rifles trustworthy. Use these tables to choose gas systems, buffer weights, and maintenance cycles that survive suppressors, seasonal ammo changes, and high round counts.

By Aditya Bawankule|Last reviewed August 2026
Assumes knowledge of
How to Build an AR-15->

Quick Answer: Gas System & Buffer Tuning

Overgassing (brass at 1-2 o'clock)? Go heavier buffer (H2→H3) or close your adjustable gas block 1-2 clicks until ejection is at 3-4 o'clock.

Short-stroking (fails to lock back)? Go lighter buffer, open gas, or check gas block alignment. Test with known hot ammo first.

Running suppressed? Start with H2 buffer + adjustable gas block. Tune gas to minimum reliable cycling, then add one click for margin.

Gas system length: Chosen per barrel, not fixed by barrel length (14.5" barrels ship with both carbine and mid-length gas). A port farther from the chamber taps lower pressure and leaves less barrel past it: on a 16" barrel the bullet spends about 258 µs past a carbine port and 190 µs past a mid-length port. Move the port on your barrel to see the dwell for each length.

Understanding the AR-15 Gas System

Before tuning your gas system, you need to understand how your rifle cycles and why changes to buffer weight, spring rate, or gas flow affect reliability. This is closely tied to your choice of bolt carrier group, as BCG weight and coating affect cycling speed. If you're choosing between direct impingement vs piston, gas tuning applies primarily to DI systems. For an alternative approach, piston systems like the PWS MK216 MOD 2 handle gas regulation mechanically. The block that seals the gas port matters too: for a set-and-forget DI carbine, our fixed low-profile gas block guide ranks the .750 picks worth buying.

The Operating Cycle

  1. Fire: The firing pin strikes the primer, igniting the powder charge and sending the bullet down the barrel.
  2. Gas Tap: As the bullet passes the gas port (a small hole in the barrel), high-pressure gas bleeds into the gas tube mounted above the barrel.
  3. Carrier Key Impact: The gas travels through the tube and enters the bolt carrier group via the carrier key, pressurizing the space between the bolt and carrier.
  4. Unlock: This pressure forces the carrier rearward while the bolt rotates and unlocks from the barrel extension.
  5. Extract & Eject: The bolt pulls the spent case from the chamber; the ejector kicks it out the ejection port.
  6. Feed: The buffer spring drives the carrier forward, stripping a fresh round from the magazine and chambering it.
  7. Lock: The bolt rotates back into battery, locking into the barrel extension, ready to fire again.
Exploded diagram of an AR-15 carbine buffer tube assembly showing the buffer tube, buffer retainer, action spring, and carbine buffer
The receiver extension holds the action spring and buffer, the reciprocating mass you tune against the gas system.

What is Backpressure?

When you fire unsuppressed, gases exit the muzzle freely into the atmosphere. With a suppressor attached, those gases are temporarily trapped inside the can's baffles while they cool and slow down (which is what reduces sound). This creates backpressure, gas that has nowhere to go but back toward the shooter.

That backpressure increases the gas volume and pressure at the gas port, which means more gas enters the system faster. The result:

  • • Higher bolt velocity: The carrier slams rearward harder than designed, increasing wear on the buffer, receiver extension, and bolt.
  • • Violent ejection: Brass flings at extreme angles (often 1-2 o'clock instead of 3-4 o'clock), sometimes damaging cases or hitting shooters beside you.
  • • Gas-to-face: Excess pressure vents rearward around the charging handle and into the shooter's eyes and nose, especially problematic under night vision or in enclosed spaces.
  • • Increased fouling: More gas cycling through the action deposits more carbon on the bolt, carrier, and inside the receiver.

The goal of gas system tuning is to bring gas volume back to factory-intended levels so the rifle runs reliably without beating itself apart.

Tuning Methods Compared

There are multiple ways to address overgassing, each with distinct trade-offs. Choose based on your build constraints, whether you run suppressed-only or switch between configurations, and how much modification you're willing to do. If you're planning a suppressed build from scratch, start with our suppressor host selection guide.

1. Adjustable Gas Blocks

Most flexible

Adjustable gas blocks replace the factory gas block with one that has a screw or detent to restrict gas flow at the source. This gives you real-time control over how much gas enters the system. Before tuning, see our best adjustable gas blocks guide to pick the right block for your barrel profile and budget.

Riflespeed Adjustable Gas Block

Riflespeed Adjustable Gas Block

$209.99

Verified Retailer
Shop at MidwayUSA

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When to use

  • • Rifles that toggle between suppressed and unsuppressed
  • • Precision builds where you want fine gas control
  • • Free-float handguards with accessible gas blocks

Considerations

  • • Requires gas block swap (not drop-in on pinned blocks)
  • • Set screws can drift under heat, use detent-style if possible
  • • Carbon lock: adjustment screws seize over time from fouling buildup
  • • Introduces another point of failure vs. a fixed gas block
  • • Need to re-tune if switching ammo types or adding suppressors

2. Buffer & Spring Tuning

Drop-in solution

Rather than restricting gas, this method absorbs excess energy after it enters the system. Heavier buffers and stiffer springs slow carrier velocity and reduce bolt bounce, managing overgassing symptoms without modifying the gas path.

VLTOR A5 Spring and Buffer Kit

VLTOR A5 Spring and Buffer Kit

$107.96

Verified Retailer
Shop at MidwayUSA

Affiliate links (?)

When to use

  • • Quick fix for moderately overgassed rifles
  • • Pinned gas blocks where you can't swap components
  • • Rifles that need to run reliably unsuppressed but also handle a can

Considerations

  • • Doesn't reduce gas volume, just manages the result
  • • Too heavy can cause short-stroking with weak ammo
  • • Carbine vs rifle extension matters for spring selection

3. Restrictive Gas Tubes (BRT EZTune)

Drop-in solution

Restrictive gas tubes replace the standard gas tube with a precision-ported version. The restricted port size limits gas volume entering the carrier key, achieving the same effect as a partially closed adjustable gas block, without touching the barrel or gas block.

Black River Tactical BRT EZTune Gas Tube - Carbine

Black River Tactical BRT EZTune Gas Tube - Carbine

$64.95

Verified Retailer
View Product

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When to use

  • • Pinned gas blocks or FSBs where block swap isn't possible
  • • Pin-and-weld builds (13.7", 14.5") where barrel work is off the table (see our barrel length guide for choosing optimal lengths)
  • • Dedicated suppressed hosts: set the port size and forget it
  • • Want gas restriction without adjustable block complexity

Considerations

  • • Port size is fixed, cannot toggle like an adjustable block
  • • ~10k round service life; plan for replacement on high-volume guns
  • • Heavy buffers work against restriction, use standard weights
  • • BRT recommends letting them select port size for your setup

4. Low Backpressure Suppressors

Suppressor choice

Some suppressors are designed to minimize backpressure by using flow-through baffles, larger internal volumes, or venting designs. These cans reduce the amount of gas pushed back into the action, often eliminating the need for other tuning methods.

Huxwrx Flow 556k

Huxwrx Flow 556k

$1,054

Verified Retailer
Shop at Primary Arms

Affiliate links (?)

When to use

  • • Planning a new suppressor purchase for a dedicated host
  • • Want to avoid modifying the rifle itself
  • • Shooting volume is high and gas-to-face is a priority concern

Considerations

  • • Generally more expensive than traditional baffle designs
  • • May sacrifice some sound suppression for lower backpressure
  • • Doesn't help if you already own a high-backpressure can

5. Carrier Modifications

Specialty option

Vented or ported bolt carriers redirect excess gas away from the shooter's face. Some carriers also feature lighter weights or different cam pin angles to change cycling dynamics. These address symptoms of overgassing rather than the root cause.

Bootleg Inc Four Position Adjustable Carrier (BP-C15-D)

Bootleg Inc Four Position Adjustable Carrier (BP-C15-D)

$199.95

Verified Retailer
View at OpticsPlanet

Affiliate links (?)

When to use

  • • Gas-to-face is the primary complaint, not reliability
  • • Already tuned gas but want less blowback during sustained fire
  • • Shooting under night vision where gas bloom is problematic

Considerations

  • • Doesn't reduce gas volume entering the system
  • • Some venting designs can increase fouling in certain areas
  • • Pair with gas-busting charging handle for maximum effect
  • Adjustable Gas Block
    Reduces Gas✓
    Drop-In✗
    Adjustable✓
    Best ForDual-use (suppressed + unsuppressed)
  • Buffer & Spring
    Reduces Gas✗
    Drop-In✓
    Adjustable~
    Best ForQuick fixes, moderate overgassing
  • BRT EZTune
    Reduces Gas✓
    Drop-In✓
    Adjustable✗
    Best ForPinned blocks, dedicated hosts
  • Low BP Suppressor
    Reduces Gas✓
    Drop-In✓
    Adjustable✗
    Best ForNew suppressor purchases
  • Vented Carrier
    Reduces Gas✗
    Drop-In✓
    Adjustable✗
    Best ForGas-to-face mitigation

Get AR-15 Gas System Tuning Guides and Buffer Reviews

Buffer weight charts, gas block setups, and suppressor tuning notes as they change. Monthly.

Free targets, drill cards, and weekly reviews by email.

AR-15 Buffer Weight Chart: Carbine, H1, H2, H3

A standard carbine buffer weighs 3.0 oz; H1 is 3.8 oz, H2 is 4.6 oz, and H3 is 5.4 oz. Each step swaps a steel weight for tungsten and adds roughly 0.8 oz. Heavier buffers slow the bolt carrier to tame overgassing; too heavy causes short-stroking, so move up one step at a time and test with your weakest ammo.

  • Carbine
    3.0 oz
    Internals3 steel
    When to Run ItFactory standard; fine for rifle-length gas and properly gassed unsuppressed carbines.
  • H1
    3.8 oz
    Internals2 steel, 1 tungsten
    When to Run ItFirst step for mid-length gas or mild overgassing; the default for most 16-inch mid-length builds.
  • H2
    4.6 oz
    Internals1 steel, 2 tungsten
    When to Run ItStarting point for suppressed rifles and carbine-length gas; handles moderate overgassing from most cans.
  • H3
    5.4 oz
    Internals3 tungsten
    When to Run ItSuppressed carbine-length gas or severe overgassing (brass at 1-2 o'clock on H2). Watch for failure to lock back.

Pick Your Starting Buffer Weight

Buffer Weight Calculator

Enter your build specs to get a starting buffer weight recommendation.

Running Suppressed?
Recommended Setup
H Buffer
Action Spring
Mil-spec or enhanced power

The goldilocks setup. H is standard; H2 adds smoothness when suppressed.

Once the calculator points you at a weight, our best AR-15 buffer systems and springs guide ranks the specific H2/H3 buffers, Sprinco springs, and A5/MK2 systems to buy for it. Running a forced reset trigger changes the math, buffer weight becomes a reset-timing variable, not just a recoil one; our AR-15 FRT tuning guide covers the H2/H3 and M16-carrier requirements a forced reset build needs.

>

Dwell Time by Gas System

Dwell is how long the bullet takes from the gas port to the muzzle. Port position sets two things at once: the pressure the port taps, and how much barrel is left past it.

Click to expand →

10.5"2 gas lengths fit
Pistol217 µs
Port @ 4.66"5.84" past the port
Carbine95 µs
Port @ 7.66"2.84" past the port
11.5"3 gas lengths fit
Pistol248 µs
Port @ 4.66"6.84" past the port
Carbine126 µs
Port @ 7.66"3.84" past the port
Mid-length58 µs
Port @ 9.66"1.84" past the port
12.5"3 gas lengths fit
Pistol278 µs
Port @ 4.66"7.84" past the port
Carbine156 µs
Port @ 7.66"4.84" past the port
Mid-length89 µs
Port @ 9.66"2.84" past the port
13.9"3 gas lengths fit
Pistol320 µs
Port @ 4.66"9.24" past the port
Carbine198 µs
Port @ 7.66"6.24" past the port
Mid-length130 µs
Port @ 9.66"4.24" past the port
14.5"4 gas lengths fit
Pistol337 µs
Port @ 4.66"9.84" past the port
Carbine215 µs
Port @ 7.66"6.84" past the port
Mid-length147 µs
Port @ 9.66"4.84" past the port
Rifle43 µs
Port @ 13.04"1.46" past the port
16"4 gas lengths fit
Pistol380 µs
Port @ 4.66"11.34" past the port
Carbine258 µs
Port @ 7.66"8.34" past the port
Mid-length190 µs
Port @ 9.66"6.34" past the port
Rifle85 µs
Port @ 13.04"2.96" past the port
18"4 gas lengths fit
Pistol436 µs
Port @ 4.66"13.34" past the port
Carbine314 µs
Port @ 7.66"10.34" past the port
Mid-length246 µs
Port @ 9.66"8.34" past the port
Rifle142 µs
Port @ 13.04"4.96" past the port
Reading the numbers
  • Moving the port back toward the chamber taps higher pressure and leaves more barrel past it, so on the same barrel carbine gas gives both more pressure and longer dwell than mid-length.
  • Port diameter is the other half: barrel makers size each port to its length, so gas length alone does not make a barrel over- or under-gassed.
  • A gas length only shows where its gas block clears the muzzle threads.
  • Times are computed from Remington UMC 55 gr .223 measured on one barrel cut down from 18 inches. Watch the port move and the carrier cycle in the 3D AR-15 gas system visualizer.

Troubleshooting Flow

Start with symptom-driven diagnostics before swapping major parts. Logging your fixes helps maintain consistency across multiple rifles.

AR-15 adjustable gas block with adjustment screw

Troubleshooting Wizard

What is the primary symptom you are experiencing?

▶Or browse entire list

Short-stroking or failure to lock back

Check

  • • Inspect gas block alignment and set screw torque.
  • • Confirm carrier key screws are staked and gas rings maintain tension.
  • • Test with known hot ammo to rule out weak loads.

Fix

  • • Open adjustable gas one or two clicks and retest.
  • • Swap to lighter buffer or spring temporarily to confirm gas deficit.
  • • Seal gas block with high-temp sealant if alignment was suspect.

Over-gassing / brass ejecting forward of 3 o'clock

Check

  • • Look for heavy extractor wear or brass shavings on deflector.
  • • Measure buffer weight and verify spring has not compressed.
  • • Confirm suppressor mount is tight and not causing secondary gas leaks.

Fix

  • • Increase buffer weight (H2 → H3) and consider a Sprinco Blue (enhanced power) or Red (extra power) spring.
  • • Close adjustable gas until ejection sits at 3–4 o'clock and bolt still locks back.
  • • Install gas busting charging handle or vented carrier to reduce blowback.

Bolt override / double feeds

Check

  • • Inspect magazines and feed lips for damage.
  • • Check extractor spring insert and O-ring condition.
  • • Verify buffer retainer and action spring are within spec length.

Fix

  • • Swap to quality magazines (PMAG or DURAMAG SPEED).
  • • Replace extractor spring and insert as preventative maintenance.
  • • Confirm buffer system matches receiver extension (carbine vs rifle).

Ejection Pattern Diagnostics

Brass ejection angle is the fastest visual diagnostic for gas system tuning. Observe where spent casings land between 3:00 and 4:30 for optimal reliability, or upload a slow-motion clip for automatic angle and throw-distance detection.

Ejection Clock Zones
Overgassed
1-2o'clockClose gas or add mass
Properly gassed
3-4:30o'clockLeave it alone
Undergassed
4:30-6o'clockOpen gas or drop mass

Video ejection analyzer

The standalone tool detects moving brass from a slow-motion clip, estimates the clock angle and apparent throw distance, then maps the result to buffer, spring, and gas-system recommendations.

Open video analyzer
Shooter
1-3
3-4
4-6

☛Click a zone to diagnose

🎯

Select a zone on the ejection chart to see diagnostics and fixes.

Field testing protocol

Fire a full magazine with your preferred ammo and observe ejection consistency. Mark the gas block setting and buffer weight in your log. Retest with suppressor if applicable, as backpressure typically shifts ejection forward by 1–2 clock positions. Aim to keep ejection at 3:30–4:00 for builds that run both suppressed and unsuppressed. Mid-length and shorter gas systems tend to need the most attention when a suppressor gets added; our URGI clone build guide covers the Super 42 buffer spring and H1/H2 buffer weight that tune a mid-length URGI upper for both suppressed and unsuppressed use.

Various H2 Buffer (4.6-4.7 oz)
Buffer Weights

Various H2 Buffer (4.6-4.7 oz)

$89.99
View at OpticsPlanet
Various H3 Buffer (5.0-5.4 oz)
Buffer Weights

Various H3 Buffer (5.0-5.4 oz)

$123.99
View at OpticsPlanet
Sprinco Blue Enhanced Power Buffer Spring
Action Springs

Sprinco Blue Enhanced Power Buffer Spring

$33.49
View at OpticsPlanet
VLTOR A5 Spring and Buffer Kit
Buffer Systems

VLTOR A5 Spring and Buffer Kit

$107.96
Shop at MidwayUSA
Riflespeed Adjustable Gas Block
Adjustable Gas Blocks

Riflespeed Adjustable Gas Block

$209.99
Shop at MidwayUSA
Superlative Arms Bleed-Off Gas Block
Adjustable Gas Blocks

Superlative Arms Bleed-Off Gas Block

$89.99
View at OpticsPlanet
Black River Tactical BRT EZTune Gas Tube - Carbine
Restrictive Gas Tubes

Black River Tactical BRT EZTune Gas Tube - Carbine

$64.95 Catalog
View Product
Black River Tactical BRT EZTune Gas Tube - Midlength
Restrictive Gas Tubes

Black River Tactical BRT EZTune Gas Tube - Midlength

$64.95 Catalog
View Product
Radian Raptor SD Charging Handle
Charging Handles

Radian Raptor SD Charging Handle

$134.95 Catalog
Shop at PSA

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Frequently Asked Questions

▶Do I need an adjustable gas block?
Not always. An adjustable gas block is most valuable if you: (1) run a suppressor and want to reduce overgassing, (2) switch between suppressed and unsuppressed frequently, or (3) have a precision build where you want fine gas control. For a dedicated unsuppressed rifle, a properly sized fixed gas block is simpler and has fewer failure points. If you only run suppressed, consider a restrictive gas tube (BRT EZTune) instead: it's drop-in and doesn't require barrel work.
▶H2 vs H3 buffer: which should I use?
Start with H2 for most suppressed AR-15s. H2 (4.6-4.7 oz) handles moderate overgassing from most suppressors while still cycling reliably with standard ammo. Move to H3 (5.4 oz) only if you're still overgassed with H2: signs include brass ejecting at 1-2 o'clock, heavy bolt bounce, or excessive wear on your brass deflector. Going too heavy causes short-stroking (failure to lock back on empty). The rule: increase buffer weight incrementally and test with your weakest ammo.
▶What does AR-15 ejection pattern tell you?
Ejection pattern is the fastest diagnostic for gas tuning. Imagine a clock face centered on your ejection port: 3:00-4:30 is ideal (proper gas volume, reliable cycling). 1-2 o'clock means overgassed: brass is being thrown too violently, causing excessive wear. 4:30-6 o'clock means undergassed: the bolt is moving too slowly, risking short-strokes. Watch where your brass lands over a full magazine and adjust gas block or buffer weight until ejection consistently hits the 3:00-4:30 window.
▶How do I fix AR-15 short stroking?
Short stroking (bolt fails to lock back on empty) means insufficient gas is reaching the carrier. Fix in this order: (1) Open adjustable gas block 1-2 clicks and retest. (2) Swap to a lighter buffer (H2→H1 or carbine). (3) Check gas block alignment; even slight misalignment between the block and the barrel port bleeds off significant gas. (4) Inspect carrier key screws are staked and gas rings maintain tension. (5) Test with known hot ammo to rule out weak loads. If all else fails, the gas port may be undersized and needs professional reaming.
▶What is the best buffer for a rifle length gas system?
For rifle length gas systems, start with an H1 buffer (3.8 oz). Rifle gas systems are the gentlest on the platform: the port sits farthest from the chamber, where the gas behind the bullet has the lowest pressure. Most rifle-length setups run fine with standard carbine or H1 buffers. Only move to H2 if you're experiencing overgassing symptoms (ejection at 1-2 o'clock, excessive bolt velocity). H3 is rarely needed for rifle gas unless suppressed.
▶Can I use a carbine buffer with a rifle length gas system?
Yes, you can mix buffer tube length and gas system length. A carbine buffer tube with rifle-length gas works fine: the gas system determines when gas hits the carrier, while the buffer tube determines spring and buffer travel. Many people run rifle-length gas with carbine buffer tubes for adjustable stocks. Just match your buffer and spring to your gas system's pressure, not your stock configuration.
▶Does a heavy buffer reduce gas?
No, a heavy buffer does not reduce gas: it only slows down the bolt carrier. The same amount of gas enters the system regardless of buffer weight. A heavier buffer absorbs more energy and slows cycling, which can mask overgassing symptoms but doesn't address the root cause. To actually reduce gas, you need an adjustable gas block to restrict flow at the source. Heavy buffers are a tuning tool, not a gas reduction solution.
▶What weight is H1, H2, and H3 buffer?
Standard carbine buffer is 3.0 oz with three steel weights. H1 is 3.8 oz (two steel, one tungsten). H2 is 4.6 oz (one steel, two tungsten). H3 is 5.4 oz (three tungsten). Each step up adds about 0.8 oz. Start with H1 for mid-length gas, H2 for carbine gas or suppressed mid-length, and H3 for suppressed carbine-length or extremely overgassed systems. Going too heavy causes short-stroking.
▶What is the best adjustable gas block for AR-15?
For most builds, Superlative Arms bleed-off gas block is the top choice: it vents excess gas forward instead of trapping it, reducing fouling and backpressure, and at under $100 it is also the value pick. Riflespeed is the premium option for tool-less adjustment with 12 detented positions. SLR Sentry sits in between, with reliable detent clicks in a lower-profile package. Avoid set-screw-only designs: they drift under heat and seize from carbon. Whichever you choose, use a dimpled barrel for consistent gas block alignment.
▶Is an adjustable gas block worth it?
Yes, if you run a suppressor and switch between suppressed and unsuppressed shooting. The ability to dial gas down when suppressed and open it up when unsuppressed prevents overgassing without swapping buffer weights. For dedicated setups (always suppressed or always unsuppressed), a properly sized fixed gas block or restrictive gas tube (BRT EZTune) is simpler and has fewer failure points. The added complexity is only worth it when you need on-the-fly adjustment.

Bottom Line

Tune gas at the source, then match reciprocating mass to what's left: minimum reliable gas plus one click, H2 before H3, and let the brass tell you when you're done.

Every method in this guide is chasing the same target, a bolt carrier that cycles fast enough to lock back on empty and no faster. Adjustable gas blocks and restrictive gas tubes fix the problem at the port; buffers, springs, and vented carriers manage whatever still gets through. Confirm your tune with a full magazine of your weakest ammo and an ejection pattern holding 3:00-4:30, then write the configuration down. Building from scratch? Spec the gas system before the first part order with our rifle builder.

Aditya Bawankule
Aditya BawankuleAuthor

Avid shooter with 10+ years of experience including competition shooting, an associate member of the Professional Outdoor Media Association (POMA), and a member of the National Shooting Sports Foundation (NSSF) and Safari Club International (SCI). Built 10+ AR-pattern rifles and several handgun platforms for home defense, competition, and suppressed night shooting.

10+ years shooting experienceCompetition shooterBuilt 10+ AR-pattern riflesAssociate member of the Professional Outdoor Media Association (POMA)Member of the National Shooting Sports Foundation (NSSF)Member of Safari Club International (SCI)

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