Primary Weapons Systems MK109 MOD1-M 9.75-inch Upper Receiver MK1-M1U-300BLK-9 Barrel Length: 9.75 in, Barrel Twist Rate: 1-6, $80.00 Off w/ Free S&H

There are plenty of AR15 Upper Receivers on the market, and if you're looking for a pistol upper receiver chambered in .300 AAC Blackout, check out Primary Weapons Systems MK109 MOD1-M. With a 9.75-inch barrel, it is the perfect size for a home defense weapon and a fun range gun, and .300 BLK packs a lot of punch that is satisfying to shoot. Plus, the MK109 MOD1-M comes with the Primary Weapons Systems Triad 30 muzzle device and their long-stroke piston system, so you're ready to roll as soon as you install it on the lower receiver. It even has Picatinny rails and M-LOK attachment points along the handguard, making it the perfect choice if you want to add attachments and optics.

MK109 MOD 1-M Upper, 9.75in Barrel, .300BLK 3 setting Adjustable Gas Regulator, PWS Long Stroke Piston System

Specifications for Primary Weapons Systems MK109 MOD1-M 9.75-inch Upper Receiver:

Features of Primary Weapons Systems MK109 MOD1-M 9.75-inch .300 AAC Blackout Upper Receiver:

• 9.75-inch Barrel
• PWS Triad 30 Muzzle Device
• Chambered in .300 BLK
• Matte Black Finish

Package Contents:

• Primary Weapons Systems MK109 MOD1-M 9.75in bbl Upper Receiver