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MK1 MOD 2-M Stripped Lower Receiver
MK1 MOD 2-M Complete Rifle Lower
MK109 MOD 2-M Upper .300BLK
MK111 Compound .223 Wylde (SBR)
Long-Stroke Revolution
Primary Weapons Systems pioneered the long-stroke piston revolution through relentless real-world testing—pitting M4 platforms against AK-47s in high-round-count scenarios that exposed direct impingement weaknesses. From those battle-hardened insights emerged the PWS piston system: cleaner operation with 80% less carbon fouling, dramatically reduced maintenance needs even in adverse conditions, and unwavering reliability that keeps AR-15 DNA intact while surpassing it.
Whether you're running the UXR .308 rifle through caliber swaps without tools, mounting FRC compensators for 70% muzzle rise reduction on rapid fire strings, or deploying the MK1 MOD 1-M 7.75" CQB upper suppressed—these aren't just products, they're engineered dominance proven across thousands of rounds where others foul out.
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FRC COMPENSATORS
SUPPRESSOR COMPATIBLE
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SUPPRESSORS AND COMPONENTS
BROWSE CLEARANCE
3D PRINTED
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BDE556K-TI AND BDE762K-TI
BDE556K-TI Suppressor
BDE762K-TI Suppressor
BDE9-TI Suppressor
BDE556-TI Suppressor
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BDE556K-TI Suppressor
BDE762K-TI Suppressor
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PREMIUM
Components
MUST-HAVES
Enhanced A5 Body Buffer, 5.35 oz
.223 Wylde Bolt
FSC Compensator- 30 (5/8x24)
FRC 2-port 308 Compensator Tapered - (5/8-24)
MK1 MOD 1-M M-LOK Replacement Rail- 114
MK1 MOD 2-M PicLok Replacement Rail- 111
Piston Head
FRC 2-port 223 Compensator Flat - (1/2-28)
Featured Products
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Primary Weapons Systems was formed by firearm enthusiasts in 2008. Starting out by producing muzzle devices, we tested our compensators on all different types of rifles - from M4/AR-15's to AK-47s.
After using both styles of rifles in testing with high round counts, the difference in maintenance needed was both astounding. From that basic realization, the PWS long-stroke piston system was born; keeping the core values of the AR-15 design, while also lessening the need for maintenance in high-volume fire situations and adverse conditions.
