Primary Weapon Systems 7.75″ MK107 Mod 1-M Complete Upper – .223 Wylde

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

Only 2 left in stock

SKU: 18-M107UA0B UPC: 811154030344

Product Description

The MK107 MOD 1-M features the tried and true PWS long stroke piston system that PWS owners have grown to know and love.

  • Operating System: PWS Long Stroke Piston System, 3 Setting Adjustable Gas Regulator
  • Caliber: .223 Wylde
  • Barrel Length: 7.75″
  • Gas System Length: Pistol
  • Barrel Twist Rate: 1:8
  • Muzzle Device: PWS Triad 556
  • Upper Receiver: PWS Proprietary Piston Upper
  • Upper Receiver Material: T6 7075 Forged.
  • Upper Receiver Finish: Anodized
  • Handguard: PWS M-LOK™ 7.1” Handguard (1.8” width, 2.1” height)
  • Charging Handle: Radian Raptor™ Ambidextrous Charging Handle




Technical Information

Size 7.75"
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