PWS MK109 MOD 2-M | .300 AAC Blackout | 9.75-inch BBL

The Primary Weapons Systems MK109 MOD 2-M complete upper is built around PWS’s long-stroke piston system and a compact 9.75-inch barrel for use on AR-15 platform builds. The free-float handguard uses patent-pending PicLok technology to accept either Picatinny or M-LOK accessories on the forward section. The assembly is finished in anodized black and is intended for compact, short-barrel AR configurations where a piston operating system and modular accessory mounting are desired.

Common applications include range training with a compact AR platform and suppressed shooting on short-barrel setups.

Product Specifications

• The manufacturer is Primary Weapons Systems (PWS).
• The model designation is MK109.
• The caliber is .300 AAC Blackout.
• The barrel length measures 9.75 inches.
• The listed twist rate is 1-8.
• The barrel type/twist is listed as 1:8.
• The finish is Anodized.
• The upper is designed to fit AR-15 platforms.
• The handguard system is specified as M-LOK with PicLok compatibility for front-mounted Picatinny or M-LOK accessories.
• The package includes the accessory listed as Radian Raptor.
• The product color is Black.
• The contour is listed as Pistol.
• The product type is a Complete Upper receiver assembly.
• The subcategory is Complete Upper Receivers.
• The UPC is 811154033192.

This MK109 MOD 2-M upper brings PWS engineering into a compact, piston-driven AR-15 package. Its PicLok-equipped free-float handguard and short barrel make it a practical choice for shooters who want a durable, modular upper for suppressed shooting and close-range practice without sacrificing build quality. The anodized finish and included features are aimed at users who value a well-engineered, serviceable upper assembly.