Gas System

Click-adjustable gas block with tool-free finger adjustment. Dial in suppressed and unsuppressed settings without removing the handguard.

Unique bleed-off design vents excess gas forward instead of restricting it. Reduces carrier velocity without the downsides of restriction.

Standard H2 buffer weight for most suppressed AR-15s. Adds mass to slow the bolt carrier and reduce felt recoil.

Heavy H3 buffer for extremely overgassed setups or short-barreled rifles. Maximum bolt carrier slowdown.

Premium braided wire buffer spring with H2 buffer. Three-strand design acts as harmonic damper and eliminates spring twang. 15% stronger return force than standard springs.

Suppressor-optimized charging handle with vented gas ports that redirect blowback away from the shooter's face.

Standard mil-spec carbine buffer tube assembly with buffer, spring, and end plate.

Heavy 303 stainless buffer with a matched flat wire spring, built to keep an AR-15 forced reset trigger cycling on a carbine tube.

Enhanced power spring that adds ~15% more resistance. Excellent for suppressed rifles or overgassed setups.

Premium braided wire buffer spring with H3 buffer for heavily suppressed builds. Maximum reciprocating mass for taming overgassed short-barrel systems.

Side-adjustable click gas block with 15 detented positions. The competition shooter's pick: dial in with a single tool from the side, no handguard removal.

A5H2 buffer, rifle-length action spring, lockplate, and castle nut for rifles already using a compatible A5 receiver extension.

Precision-ported gas tube that restricts flow at the source. Set-and-forget solution for suppressed rifles without requiring gas block removal or adjustments.

Budget set-screw adjustable gas block with 20-click ball detent. Carbon steel with nitride finish.

Aero's set-screw adjustable gas block with black nitride finish, 15 gas settings, and a serviceable low-profile body.

Precision-ported midlength gas tube for 14.5"–16" barrels. Drop-in gas restriction without touching the gas block.

Carbine buffer body with a mix of aluminum, steel, and tungsten weights so you can tune anywhere from 1.7 to 5.6 ounces.

Weight-adjustable carbine-length .308 buffer, 3.45 to 4.65 oz, for tuning reciprocating mass on a 16 inch AR-10 forced reset trigger build.

Titanium-nitride-coated National Match gas piston that smooths the M1A's action and resists galling for more consistent operation.

40-position fine-adjust gas block with tool-less selection. Suppressed and unsuppressed positions in the same hardware at a mid-tier price.

Aero's fixed .750 set-screw block in nitride-finished 4140 steel. The non-adjustable sibling to Aero's adjustable block, at roughly half the price for builders who do not need to tune.

Captured multi-stage recoil spring that replaces the buffer and spring in a carbine tube, available in C, H, H2, and H3 equivalent weights.

USGI-spec steel fixed block with phosphate finish and set-screw mounting. BCM's no-nonsense .750 block built to the same standard as their duty barrels.

Intermediate-length recoil system with its own 8-position receiver extension, rifle-length spring, and a tungsten buffer in T0, T1, or T2 weight.

Precision-ported pistol-length gas tube for SBRs and AR pistols. Essential for high-backpressure short barrels.

Six-position mil-spec carbine buffer tube kit with a 3 oz carbine buffer, action spring, castle nut, and QD receiver end plate in the box.

Fixed .750 block offered in 303 stainless or black-nitride steel, secured with two set screws. A match-grade maker's mid-tier block: a step up in material and finish over commodity blocks.

17-4 stainless fixed block with set-screw mounting and an optional bombproof coil pin. Geissele's answer to gas blocks that walk loose under hard use.

Three-position adjustable gas regulator and piston tuned for caliber and barrel length, with hand-rotatable knob.

JP's D2 Series two-piece adjustable gas block with 52-click front adjustment. A compact detent-adjustable option for high-end AR builds.

Fully captured spring and buffer assembly that eliminates spring twang and bolt bounce, with an included spacer for carbine or rifle tubes.

Adjustable AKM gas piston for tuning overgassed rifles and suppressor backpressure.

Six-ounce hydraulic buffer for 8-inch-plus or suppressed simple-blowback 9mm PCCs with a carbine tube.

Buffer-level roller delay for compatible 9mm AR blowback bolts, offered for carbine and Maxim CQB tubes.

4140 steel fixed block with three set screws for a more secure clamp on the journal. Offered in .625, .750, and .936 to fit nearly any barrel shoulder.

303 stainless heavy buffer with a matched flat wire spring, tuned for AR-9 blowback PCCs running a forced reset trigger.

4140 chromoly fixed block offered in both set-screw and clamp-on variants, letting builders choose between the cheaper screw mount and the no-dimple clamp design.

Budget set-screw fixed low-profile gas block for .750 journals. The price floor for a functional .750 block on a standard-pressure carbine.

Six-position mil-spec carbine receiver extension with a fluted 7075 body and the ratchet-lock castle nut and endplate in the box.

Ultra-low-profile fixed micro block in steel or titanium, set-screw or clamp-on. The minimalist pick for tight handguards where a standard block will not clear.

Extra-extra power spring for heavy-caliber carbines and extremely overgassed systems. Maximum resistance for aggressive tuning.

4140 steel .750 fixed block with black nitride finish, dual set screws, a skeletonized body, and an alignment notch to index the gas port. A step up from commodity blocks at a near-budget price.

David Tubb's lightweight flatwire AR action spring, built for low-pressure loads and useful for tuning down an over-driven blowback action.

17-4 stainless two-screw fixed .750 block from a lightweight-build specialist. Titanium micro variants in .625 are also offered for weight-focused builds.

Long-running .750 set-screw fixed gas block from YHM. A proven commodity block at a budget price, with an optional pinch-screw variant for clamp-style mounting.

Complete EPC-9 carbine recoil system with an 8.1-ounce extended buffer, action spring, enhanced receiver extension, end plate, and castle nut.

Standard fixed-flow stainless gas tube for AR barrels with a carbine-length gas system. Includes the installation roll pin.

Standard fixed-flow stainless gas tube for AR barrels with a mid-length gas system. Includes the installation roll pin.

Standard fixed-flow stainless gas tube for AR barrels with a pistol-length gas system. Includes the installation roll pin.

Standard fixed-flow stainless gas tube for AR barrels with a rifle-length gas system. Includes the installation roll pin.

Mil-spec rifle-length action spring for BCM MK2 receiver extensions and buffers.

Six-position 7075-T6 carbine receiver extension for mil-spec collapsible stocks.

3.8 oz intermediate-length buffer for the BCM MK2 receiver extension and M16 rifle action spring.

4.7 oz intermediate-length buffer for the BCM MK2 receiver extension and M16 rifle action spring.

5.6 oz intermediate-length buffer for the BCM MK2 receiver extension and M16 rifle action spring.

6.5 oz intermediate-length buffer for the BCM MK2 receiver extension and M16 rifle action spring.

7.4 oz intermediate-length buffer for the BCM MK2 receiver extension and M16 rifle action spring.

Intermediate-length 7075-T6 receiver extension for BCM MK2 buffers and an M16 rifle action spring.

BCM's steel QD receiver end plate paired with the FCD CNF castle nut for a conventional staked carbine installation.

Precision-ported rifle-length gas tube that reduces excess gas without an adjustable gas block.

Six-position 7075 aluminum carbine receiver extension with mil-spec stock dimensions and four finish choices.

Heat-treated 4130 steel receiver end plate with QD sling sockets on both sides for left- or right-side attachment.

Standard 3.0-ounce carbine buffer for AR-15 recoil systems using a mil-spec carbine receiver extension.

4.6-ounce H2 carbine buffer for adding reciprocating mass to an AR-15 with a mil-spec carbine receiver extension.

Stamped-steel AR-15 receiver end plate with a rear-facing QD sling socket and manganese-phosphate finish.

Stakable FCD CNF castle nut paired with the steel ESF-H1 rear-QD end plate for a carbine receiver extension.

KAC carbine receiver end plate with ambidextrous rotation-limited QD sockets and its matching lock ring.

Castle nut and endplate set that locks by ratchet and fits any mil-spec receiver extension.

Standard-power rifle-length chrome-silicon spring explicitly specified for VLTOR A5 receiver extensions.

Seven-position mil-spec carbine receiver extension with scalloped flats and a supported buffer retainer.

Rifle-length action spring built to VLTOR's A5 length, coil-count, and wire-diameter specifications.

3.8 oz standalone buffer for a VLTOR A5 receiver extension and rifle-length action spring.

4.56 oz standalone buffer for a VLTOR A5 receiver extension and rifle-length action spring.

5.3 oz standalone buffer for a VLTOR A5 receiver extension and rifle-length action spring.

6.08 oz standalone buffer for a VLTOR A5 receiver extension and rifle-length action spring.

6.83 oz standalone buffer for a VLTOR A5 receiver extension and rifle-length action spring.

Seven-position receiver extension for VLTOR A5 buffers and rifle-length action springs.

Conventional AR-15 receiver-extension hardware with a standard end plate and stakable castle nut.