PWS MK109 MOD 1-M Upper | .300 AAC Blackout | 9.75″

The PWS MK109 MOD 1-M is a complete AR-15 upper chambered in .300 AAC Blackout with a 9.75-inch barrel and PWS’ long-stroke piston system. It features a free-float PicLok handguard, a three-setting adjustable gas system for tuning and suppressor use, and the PWS Triad 30 muzzle device. The upper is finished in anodized black and is built to integrate with AR-15 platform lowers.

Product Specifications

• The caliber is .300 AAC Blackout.
• The barrel length is 9.75″.
• The barrel twist is listed as 1:8.
• The product includes a PWS Long Stroke Piston System for reduced fouling and consistent operation.
• The gas system is described as a 3-setting Adjustable Gas System to optimize performance and suppressor use.
• The handguard is a PicLok free-float design combining Picatinny and M-LOK interface options.
• The muzzle device is a PWS Triad 30 unit intended to mitigate muzzle rise.
• The barrel is described as a Boise-made precision barrel and the product notes a sub-MOA accuracy guarantee with quality ammunition.
• The finish is listed as Anodized.
• The upper is designed to fit an AR-15 platform.
• The model designation is MK109.
• The product type is a Complete Upper Receiver.
• Included accessory listing shows a Radian Raptor (charging handle) in the attributes.
• The listed cartridge is .300 AAC Blackout.
• The UPC is 811154033451.

The MK109 MOD 1-M upper is configured for suppressed and short-barrel applications where controllability and reduced fouling are priorities. Its adjustable gas system and PicLok handguard offer adaptability for suppressed range use and short-range field applications. Built around PWS’ piston architecture and precision barrel work, this upper is aimed at users who want a compact, tunable .300 AAC Blackout option for the AR-15 platform.