PWS MK1 Mod 1-M Upper .223 Wylde 11.85″ Black

The Primary Weapons MK1 Mod 1-M complete upper is a compact, purpose-built AR-15 upper chambered in .223 Wylde with an 11.85″ barrel. It employs the PWS long-stroke piston system and a free-float MLOK handguard for reduced fouling and versatile accessory mounting. The assembly includes a forged 7075-T651 upper receiver, forward assist controls, and is finished in black anodize. The design is optimized for users who want a reliable, serviceable upper that supports suppressed use and varied operational roles.

Key Specifications

• The caliber is .223 Wylde.
• The barrel length is 11.85″.
• The barrel finish is Black Anodized.
• The receiver finish is Anodized.
• The handguard is Free-float MLOK.
• The operating system is a PWS long-stroke piston.
• The rate of twist is 1-8.
• The subcategory is Complete Upper Receivers.
• The fit is AR-15.
• The model is MK1.

Built to provide dependable function and straightforward serviceability, this PWS upper pairs a proven piston system with a precision barrel and a modular mounting interface. Its compact profile and suppressor-optimized features make it suitable for a range of practical applications where reliability and low maintenance are priorities.