NewsJanuary 27, 2026

PWS MK216 MOD 2: New .308 Piston Rifle at SHOT Show 2026

Primary Weapons Systems' MK216 MOD 2-M is now shipping at $2,599.95, a 16-inch .308 piston rifle with a proprietary bore evacuator that vacuums gas forward when shooting suppressed. The platform combines AK-style long-stroke piston reliability with AR-10 ergonomics and precision.

Key Takeaways

→Bore Evacuator: Unique barrel feature that vacuums excess gas out the front of the rifle, significantly reducing backpressure when suppressed
→Long-Stroke Piston: AK-47 inspired operating system with tighter tolerances for improved accuracy and 3,000-4,000 round suppressed intervals between deep cleaning
→User-Tunable Gas Block: Three settings plus a maintenance position for easy piston system access
→Pricing & Availability: Now shipping at $2,599.95 for the 16-inch MOD 2-M .308; 6.5 Creedmoor to follow

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The Bore Evacuator: PWS's Suppressor Innovation

The standout feature of the MK2 MOD 2 is the bore evacuator integrated into the barrel. This system creates a vacuum effect that pulls excess propellant gas forward and out the muzzle, rather than letting it blow back into the action and toward the shooter.

PWS MK2 MOD 2 bore evacuator detail showing the helical-cut barrel feature — The bore evacuator feature visible on the MK2 MOD 2 barrel (Credit: TFBTV)

When shooting suppressed, backpressure is one of the primary challenges with gas-operated systems. The bore evacuator addresses this by actively directing gases away from the shooter, making the platform particularly well-suited for suppressor use. PWS describes this as something no other manufacturer is currently doing in the AR-10 space. For 5.56 platforms, Q's new The Lefty suppressor offers similar low backpressure benefits using Low Blow directional flow technology.

PWS UXR rifle showing the barrel and FRC compensator muzzle device — PWS barrel with bore evacuator technology (Credit: Primary Weapons Systems)

Long-Stroke Piston Operation

The MK2 MOD 2 uses PWS's proven long-stroke piston system, which draws inspiration from the AK-47's operating mechanism. Unlike the AK's looser tolerances, the PWS implementation maintains tighter machining standards to deliver AR-platform accuracy while retaining the reliability benefits of the long-stroke design.

PWS MK1 MOD 2 piston-driven upper assemblies showing the long-stroke piston system — PWS long-stroke piston upper assemblies (Credit: Primary Weapons Systems)

One significant advantage of the piston system: reduced carbon buildup in the action. PWS states that users can fire 3,000-4,000 rounds suppressed before needing a thorough cleaning, compared to the more frequent maintenance intervals required by direct impingement systems.

PWS MK2 MOD 2 long-stroke piston and bolt carrier group laid out on table — The long-stroke piston operating rod and bolt carrier group (Credit: TFBTV)

Adjustable Gas Block

The MK2 MOD 2 features a user-adjustable gas block with multiple settings to optimize performance across different shooting conditions:

Gas Block Settings

UnsuppressedStandard cycling without suppressor
Suppressed (2 positions)Optimized for suppressor backpressure
MaintenanceEasy access for piston system cleaning

The maintenance setting is a standout feature that allows users to quickly access the piston system for cleaning without tools, addressing one of the common complaints about piston AR platforms.

MK216 MOD 2-M Specifications

PWS MK216 .308 long-stroke piston rifle (Credit: SWAT Magazine)

MK216 MOD 2-M Key Specifications

Caliber.308 Winchester / 7.62x51 NATO
Barrel16" 41V50 CMV, 1:10 twist
Operating SystemLong-Stroke Piston
Bore EvacuatorIntegrated barrel feature
Gas BlockAdjustable, 3 settings
Muzzle DevicePWS FRC 3-Port Compensator
HandguardPicLok (M-LOK + Picatinny)
Charging HandleRadian Raptor ambidextrous
TriggerMil-Spec Enhanced, 5.5–6.5 lb
StockMagpul MOE SL
Weight8.8 lbs unloaded
AccuracySub-MOA (quality ammunition)
ControlsFull Ambidextrous
MSRP$2,599.95
AvailabilityNow shipping

Full Ambidextrous Controls

The MK2 MOD 2 features fully ambidextrous controls with enlarged paddle sizes for improved operation under stress or while wearing gloves. The aesthetics carry over from the MOD 1 series while incorporating the A5 buffer tube system.

PWS MK1 MOD 2 complete lower receiver assembly showing ambidextrous safety and magazine release controls — PWS MOD 2 complete lower with ambidextrous controls (Credit: Primary Weapons Systems)

PWS emphasizes this is a "buy once, cry once" platform: a rifle built to last a lifetime with factory tuning that eliminates the need for aftermarket gas adjustments or modifications.

Suppressor-Ready Muzzle Devices

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American Precision Arms Gen 4 Little Bastard Self-Timing Muzzle Brake (.30 cal, 5/8x24)

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Planned Caliber Variants

PWS plans to expand the MK2 MOD 2 lineup beyond .308 Winchester:

Planned MK2 MOD 2 Variants

.308 WinchesterNow shipping
6.5 CreedmoorFollowing .308 release

PWS MK116 MOD 2-M rifle official product shot — PWS MOD 2 series rifle (Credit: Primary Weapons Systems)

The MK2 MOD 2 series will be available as complete rifle systems, standalone MOD 2 uppers, and full MOD 2 builds. PWS also offers unique anodized finishes including Kodiak Brown. Piston-driven AR-15s are gaining momentum: IWI also entered the space with the ARAD 5 ($1,499), a short-stroke piston AR-15 with standard lower compatibility.

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Frequently Asked Questions

▶What is the PWS MK216 MOD 2?

The PWS MK216 MOD 2 is a .308 Winchester long-stroke piston rifle from Primary Weapons Systems, unveiled at SHOT Show 2026. It features an integrated bore evacuator that vacuums gas forward when shooting suppressed, a user-adjustable gas block with three settings plus a maintenance position, and fully ambidextrous controls. The 16-inch MOD 2-M variant is now shipping at a $2,599.95 MSRP and ships with a 20-round Magpul PMAG.

▶What is the bore evacuator on the PWS MK2 MOD 2?

The bore evacuator is a proprietary barrel feature that creates a vacuum effect, pulling excess propellant gas forward and out the muzzle rather than letting it blow back into the action and toward the shooter. It directly addresses the backpressure problem that plagues gas-operated AR-10s when suppressed. PWS states no other manufacturer is currently offering this feature in the AR-10 space.

▶How much does the PWS MK2 MOD 2 cost?

The 16-inch MK216 MOD 2-M .308 carries a $2,599.95 MSRP and is now shipping. That places it in premium AR-10 territory alongside LMT, KAC, and SCAR offerings. The value proposition is the combination of long-stroke piston reliability, factory suppressor optimization via the bore evacuator, extended maintenance intervals, and a sub-MOA accuracy guarantee.

▶When is the PWS MK216 MOD 2 available?

The MK216 MOD 2-M in .308 Winchester is now shipping to dealers at a $2,599.95 MSRP. The 6.5 Creedmoor variant will follow. PWS also offers the MK2 MOD 2 as complete rifle systems, standalone MOD 2 uppers, and full MOD 2 builds with finishes including Kodiak Brown anodizing.

▶How does PWS long-stroke piston differ from a standard AR piston system?

PWS's long-stroke piston system draws inspiration from the AK-47's operating mechanism, where the piston is permanently attached to the bolt carrier and travels the full length of the bolt stroke. Unlike the AK's looser tolerances, PWS maintains tighter machining standards to deliver AR-platform accuracy. Short-stroke piston systems, by contrast, use a separate piston that only contacts the carrier briefly. Long-stroke reduces carbon buildup in the action and enables the 3,000-4,000 round suppressed intervals PWS cites.

▶What calibers will the PWS MK2 MOD 2 come in?

The MK216 MOD 2 ships first in .308 Winchester/7.62x51 NATO, now available as the 16-inch MOD 2-M at $2,599.95. A 6.5 Creedmoor variant will follow. Both calibers benefit from the bore evacuator and adjustable gas block designed specifically for suppressed shooting.

▶Does the PWS MK2 MOD 2 have ambidextrous controls?

Yes. The MK2 MOD 2 features fully ambidextrous controls with enlarged paddle sizes for improved operation under stress or while wearing gloves. The controls carry over the MOD 1 aesthetics while incorporating the A5 buffer tube system. PWS positions the platform as a "buy once, cry once" rifle built to last without requiring aftermarket modifications.

▶How often do I need to clean the PWS MK2 MOD 2?

PWS states users can fire 3,000-4,000 rounds suppressed before needing a thorough cleaning, thanks to the long-stroke piston system keeping carbon out of the action. That compares favorably to direct impingement suppressed guns, which typically require more frequent maintenance. The adjustable gas block also includes a dedicated maintenance position for tool-free piston system access.

What This Means

The MK2 MOD 2 represents PWS doubling down on what they do best: building piston-driven AR platforms optimized for hard use. The bore evacuator is a genuinely novel feature in the AR-10 space, addressing one of the fundamental challenges of running .308 platforms suppressed.

At $2,599.95, the MK216 MOD 2-M sits in premium territory alongside offerings from LMT, KAC, and SCAR. The value proposition centers on the combination of long-stroke piston reliability, factory suppressor optimization, and the bore evacuator technology that PWS claims no competitor currently offers.

For shooters running suppressed .308 setups, the extended maintenance intervals (3,000-4,000 rounds between deep cleaning) and reduced gas blowback could justify the premium over direct impingement alternatives. For a deeper look at how piston systems compare to DI, see our DI vs Piston guide. For tuning DI rifles to match piston-like reliability suppressed, see our gas system and buffer tuning guide.

Browse our Platform Catalog, or use our Interactive Builder to configure your own suppressor-optimized setup with current platforms.