Primary Weapon Systems 11.85″ MK111 Mod 1-M Complete Upper – .223 Wylde

Original price was: $1,099.95.Current price is: $1,029.49.

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SKU: 18-M111UA0B UPC: 811154030351

Product Description

The revamped MK111 MOD 1-M line features the tried and true PWS long stroke piston 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 MK111 MOD 1-M line is a go-to for not only civilians but also Law Enforcement. With a fully forged receiver the MK111 MOD 1-M is a no-nonsense tool for when you need a high-value option that is relentless and unstoppable.


  • System: PWS Long Stroke Piston System, 3 settings Adjustable Gas Regulator
  • Caliber: .223 Wylde
  • Barrel Length: 11.85”
  • Gas System Length: Carbine
  • Barrel Twist Rate: 1:8
  • Muzzle Device: PWS Triad 556
  • Upper Receiver: PWS Proprietary Piston Upper
  • Material: T6 7075 Forged, Anodized
  • Handguard: PWS M-Lok™ 11.05” Handguard (1.7” width, 2.25” height)
  • Charging Handle: Radian Raptor™ Ambidextrous Charging Handle




Technical Information

Size 11.85"
Caliber .223 Wylde
Barrel Twist 1/8
Thread Pitch 1/2 x 28
Gas System Piston
Material 7075 Aluminum
Finish Anodized
Firearm Compatibility

Catalog Location

California Prop 65 Warning

WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information visit