Windham Weaponry .300 Blackout Pistol Complete Upper

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This .300 Blackout AR Pistol Complete Upper assembly includes a 9” Medium Profile barrel with a 7″ (177.8mm) Windham Weaponry M-LOK Free-Float Railed Handguard with strategically placed QD Mount Locations and Kriss Polymer Front and Rear Flip Sights installed. The barrel has a Melonite QPQ finish with an A2 flash suppressor and M4 Feed Ramps and is made of 4150 Chrome Moly Vanadium 11595E steel. It is rifled 1 turn in 7” with a right-hand twist. The receiver assembly is complete with Bolt Carrier Assembly, Charging Handle, Forward Assist, and Ejection Port Cover. Also available without Charging Handle and Bolt Carrier Assembly.

The .300 Blackout Caliber ammunition will function in .223 / 5.56mm magazines, but for safety’s sake do not mix up the two ammunitions – which is why we Laser Engrave the Upper as .300 Blackout Caliber. Chambering incorrect ammunition in your upper could cause catastrophic damage or injury. Always use factory ammunition that corresponds to the caliber stampings on the barrel.


NOTICE: THIS PART MUST BE USED IN – OR WITH – A PISTOL OR TITLE II RECEIVER (NFA REGISTERED) FOR LEGALITY. This requirement is in accordance with Title 27 Code of Federal Firearms Regulations [Subpart B-Definitions (479.11) (a) thru (g) under Firearms]. For any further questions you may have concerning Local, State or Federal compliance, please contact the Alcohol, Tobacco, & Firearms Bureau. Local listings available at

CALIFORNIA RESIDENTS ONLY – WARNING: Cancer and Reproductive Harm –


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