brownells primary weapon system mk109 pro upper reciever ar15 300black out 300blk upper long stroke piston 1

Primary Weapon Systems known for their extremely reliable and rugged long-stroke piston powered AR-15 variant weapons has announced their new MK109 PRO upper chambered in .300blk.

Primary Weapon Systems has made the MK109 PRO uppers are available exclusively through Brownells.

Brownells states “The Primary Weapons System long-stroke gas-piston upper receiver is one of the more-innovative developments to hit the AR-15 market in recent years, and now, you can get your hands on a unique variant of this system straight from Brownells!

The PWS MK109 PRO upper receiver chambered in 300 Blackout contains everything you need to get your AR-15 set up right.”

brownells primary weapon system mk109 pro upper reciever ar15 300black out 300blk upper long stroke piston 2.jpg

SPECIFICATIONS:

-Barrel length: 9.75 inches

-Overall length: 18.5 inches

-Weight: 3 pounds, 10 ounces

-All-black finish

-Cartridge: 300 AAC Blackout

-Finish: Black

-Length: 18.5″

-Muzzle: Flash Hider

-Style: Complete

-Twist: 1-8

brownells primary weapon system mk109 pro upper reciever ar15 300black out 300blk upper long stroke piston 6.jpg
To learn more about the MK109 PRO upper. CLICK HERE

brownells primary weapon system mk109 pro upper reciever ar15 300black out 300blk upper long stroke piston 7.jpg

EXTRA GALLERY. CLICK TO ENLARGE

brownells primary weapon system mk109 pro upper receiver ar15 300black out 300blk upper long stroke piston
brownells primary weapon system mk109 pro upper receiver ar15 300black out 300blk upper long stroke piston
brownells primary weapon system mk109 pro upper receiver ar15 300black out 300blk upper long stroke piston