Brownells 75th Anniversary - A Shooting Heritage
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The Primary Weapons Systems MK1 MOD 1-M line of upper receivers feature the PWS long stroke piston system. Internally, this line offers the tried and true system that PWS owners have grown to know and love. Featuring a free-float MLOK handguard, forward assist controls, and a more true to mil-spec design, the MK1 MOD 1-M line is a go-to for not only civilians, but also Law Enforcement. With the fully forged upper, the MK1 MOD 1-M is a no-nonsense tool for when you need a high value option that is relentless and unstoppable.

PWS bring back the original MK109 in 300BLK. The 9.75" barrel length provides excellent reliability with a range of ammunition and still function well, with or without a suppressor and without the need for an adjustable gas system.
The MK109 includes the Triad 30 Compensator.

  • Long stroke piston system
  • M-LOK handguards
  • Includes Radian Raptor Charging Handle
  • 1:8 barrel twist rate

With the fully forged upper, the MK1 MOD 1-M is a no-nonsense tool for when you need a high value option that is relentless and unstoppable.
All NFA rules apply.
 


Big Book Catalog, Issue:73, Page:006

PRIMARY WEAPONS - AR-15 MK1 MOD 1-M UPPER RECEIVER ASSEMBLY 300 BLACKOUT M-LOK

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Cartridge: 300 AAC Blackout

Length: 9.75"

Twist: 1-8