The Primary Weapons Systems Pws Mk109 Mod 1-m Upper 300blk 9.75 Ls Frc Comp delivers precision and reliability in a compact, suppressor-ready platform built around the renowned PWS Long Stroke Piston System, offering proven reliability and reduced fouling. A configurable 3-setting Adjustable Gas System lets you dial in optimal gas flow for a wide range of shooting conditions and suppressor use, while maintaining clean operation across various ammunition types and environmental factors. This upper integrates Sub-MOA accuracy with Boise-made precision barrels, ensuring exceptional performance with high-grade ammo. The suppressor-optimized design minimizes back pressure and gas blowback to deliver a cleaner, more comfortable shooting experience, and the 300 BLK chambering is meticulously engineered for outstanding accuracy and reliability with both supersonic and subsonic rounds. The PWS Triad 30 muzzle device helps mitigate recoil and muzzle rise, enhancing control, while the innovative PicLok Handguard blends Picatinny and M-LOK support for versatile accessories without sacrificing ergonomics. Completing the package, The PWS VOW warranty provides reassurance through repair or replacement for defects, ensuring continued confidence and satisfaction in this advanced upper assembly.