Primary Weapons Systems is a federally-licensed firearms manufacturer in Boise, Idaho (est. 2007). They produce AR-15 (MK1) and AR-10 (MK2) rifles, uppers, muzzle devices, suppressors, handguards, and buffer systems using in-house CNC machining.

What is the difference between the MK1 MOD 1-M and MOD 2-M?

MOD 1-M has a KeyMod (PicMod) handguard. MOD 2-M has M-LOK and a fully ambidextrous lower. Both use the PWS long-stroke piston with a 3-setting adjustable gas regulator.

How do I identify my PWS model?

MOD 0: quad-rail (pre-mid-2015). MOD 1: KeyMod with forward assist. MOD 1-P: updated KeyMod (2016). MOD 2-M: M-LOK with ambi controls. Model and serial are on the lower receiver.

What calibers does PWS offer?

MK1: .223 Wylde, .300 BLK, 7.62x39. MK2: .308 Win / 7.62 NATO, 6.5 Creedmoor. PCC: 9mm.

What does the PWS long-stroke piston system do?

It cycles the bolt carrier via a full-length operating rod and gas piston, keeping carbon and heat out of the receiver. The 3-setting gas regulator supports standard, suppressed, and adverse-condition use.

What buffer weight should I use with a PWS upper?

H2 buffers are recommended. A standard carbine buffer can cause over-gassing. Use the H2 Enhanced Buffer (4.4 oz) for standard use or H2 Suppressor Weight Buffer (4.5 oz) for suppressed fire.

What is the difference between PWS buffer tubes?

Enhanced Buffer Tube: 6-position for stocks or braces. Pistol Buffer Tube: fixed-length for AR pistols. Modified Enhanced Buffer Tube: Law Tactical folding adapter compatible. All include the Ratchet Lock Castle Nut and Endplate Set.

A 1/2x28 flash suppressing compensator for .223/5.56 that reduces both muzzle flash and rise. BATFE has confirmed it is not a suppressor.

Does PWS make muzzle devices for AK and HK rifles?

Yes. FSC47 MOD 2 and JTAC47 are 14x1 LH for AK-47. FSC HK is 15x1 for HK91/G3. CQB74 is 24x1.5mm for .308 HK platforms.

What suppressors does PWS make?

BDE 22 (.22 LR), BDE 556 (5.56), BDE 9 (9mm), BDE 762 (.308/7.62), BDE 338 (.338/8.6), BDE 45 (.45). All modular and serviceable. NFA - Form 4 and $200 tax stamp required.

What is the T3 Summit?

A straight-pull biathlon toggle bolt action for Ruger 10/22-compatible platforms in .22 LR. Available as a complete rifle or bare action with P3 extended magazine release.

Does PWS offer LE or military discounts?

Yes. Use the contact form at primaryweapons.com/contact and select LE/MIL Discount as the subject.

How do I find an authorized PWS dealer?

Use the dealer locator at primaryweapons.com/locator/partnership/dealerlist. To become a dealer visit primaryweapons.com/locator/partnership/index.

Where are PWS product manuals?

Available at primaryweapons.com/pws-manuals. Contact customer service to request a hard copy.

How do I submit a warranty or RMA?

Submit at primaryweapons.com/warrantyrequest. Warranty info at primaryweapons.com/pws-warranty.

What is the expected barrel life of a PWS rifle?

.223 Wylde: 20,000-30,000 rounds. .300 BLK: 15,000-20,000. 7.62x39: 10,000-15,000. Varies with suppressor use, maintenance, and ammo.

Parts - AR Upper Parts - Page 1 - Primary Weapons Systems

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MK118 MOD 2-M Upper .223 WYLDE

The MK118 MOD 2-M Upper operates on the highly acclaimed PWS Long Stroke Piston System, renowned for its reliability and reduced fouling. The inclusion of a 3-setting Adjustable Gas System allows users to fine-tune gas flow, ensuring optimal performance...

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MK118 MOD 1-M Upper .223 WYLDE

The MK118 MOD 1 Upper delivers unmatched precision and versatility, now chambered in the highly efficient 6MM ARC. Designed to provide flat trajectories, reduced recoil, and exceptional energy retention, this upper is perfect for precision shooters,...

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MK111 MOD 2-M Upper 7.62x39

The MK111 MOD 2-M Upper operates on the highly acclaimed PWS Long Stroke Piston System, renowned for its reliability and reduced fouling. The inclusion of a 3-setting Adjustable Gas System allows users to fine-tune gas flow, ensuring optimal performance...

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FSC Compensator- 30 (5/8x24)

The patented FSC compensator was designed to be an effective compensator for shooters in all situations. Offering recoil reduction as a primary function, and flash suppression as a secondary function, the FSC is one of the most popular PWS compensators...

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FRC 2-port 308 Compensator Tapered - (5/8-24)

Elevate your shooting experience with the cutting-edge PWS FRC compensator, specifically designed for tapered rifle barrels and serving as a suppressor host for the Rearden Atlas suppressor mounting system—compatible with popular suppressors like...

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FRC 2-port 223 Compensator Flat - (1/2-28)

Elevate your shooting experience with the cutting-edge PWS 3-Port FRC square shoulder compensator, specifically designed to serve as a suppressor host for the Rearden Atlas suppressor mounting system—compatible with popular suppressors like the BDE...

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MK109 MOD 2-M Upper .300BLK

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The MK1109 MOD 2-M Upper operates on the highly acclaimed PWS Long Stroke Piston System, renowned for its reliability and reduced fouling. The inclusion of a 3-setting Adjustable Gas System allows users to fine-tune gas flow, ensuring optimal performance...

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PRC Compensator- 30 (5/8x24)

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The PRC compensator, originally introduced for .30 only, was designed to reduce felt recoil as much as possible. Redesigned in 2018, now in a variety of caliber options, this compensator is very effective in reducing felt recoil, while being California...

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FSC Compensator- 47 (14x1 LH)

The patented FSC compensator was designed to be an effective compensator for shooters in all situations. Offering recoil reduction as a primary function, and flash suppression as a secondary function, the FSC is one of the most popular PWS compensators...

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MK111 MOD 1-M Upper 7.62x39

The MK111 MOD 1-M Upper is equipped with the renowned PWS PWS long-stroke piston system, maintaining the reliability that PWS owners have come to trust. This line features a free-float MLOK handguard, forward assist controls, and a design closer to...

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FRC 2-port 223 Compensator Tapered - (1/2-28)

Elevate your shooting experience with the cutting-edge PWS FRC compensator, specifically designed for tapered rifle barrels and serving as a suppressor host for the Rearden Atlas suppressor mounting system—compatible with popular suppressors like...

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FRC 3-port 223 Compensator Flat - (1/2-28)

Elevate your shooting experience with the cutting-edge PWS 3-Port FRC square shoulder compensator, specifically designed to serve as a suppressor host for the Rearden Atlas suppressor mounting system—compatible with popular suppressors like...

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$99.95

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FRC 3-port 308 Compensator Tapered - (5/8-24)

Elevate your shooting experience with the cutting-edge PWS FRC compensator, specifically designed for tapered rifle barrels and serving as a suppressor host for the Rearden Atlas suppressor mounting system—compatible with popular suppressors like...

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$99.95

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FRC 3-port 223 Compensator Tapered - (1/2-28)

Elevate your shooting experience with the cutting-edge PWS FRC compensator, specifically designed for tapered rifle barrels and serving as a suppressor host for the Rearden Atlas suppressor mounting system—compatible with popular suppressors like...

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$99.95

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MK111 MOD 1-M Upper .223 Wylde

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The MK111 MOD 1-M Upper is equipped with the renowned PWS PWS long-stroke piston system, maintaining the reliability that PWS owners have come to trust. This line features a free-float MLOK handguard, forward assist controls, and a design closer to...

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JTAC 47 Compensator

The JTAC47 was the first muzzle device created by PWS and remains one of our most popular to this day. Specifically made for the AK47, the JTAC47 reduces felt recoil without a significant increase in blast noise being directed toward the shooter or...

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$57.95

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