Return to 10.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE NERO 12.62" M-LOK RAIL

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Great fit & finish September 28, 2018 : Shawn Lachance from GREEN COVE SPRINGS, FL United States   I purchased this 300 BO upper for my pistol "build". This is my first upper & WILL NOT be my last from MAS Defense. I have sent 500 plus rds down range over the past couple of months and this upper works flawlessly! Very satisfied customer. Thanks MAS D! Was this review helpful to you?

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Great overall experience April 15, 2018 : Justin C   This is the second time ive ordered from MAS. Shipping was super fast, everything looks and functions great! I will be ordering again soon! Was this review helpful to you?

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Best I've found April 15, 2018 : Christopher L   I just bought this 10.5 300 blackout Nero railed upper as my second purchase from MAS. I research everything to death and HATE buyer's remourse. I have bought from 6-8 online vendors, but everytime I go to grab an AR it's my MAS Defense one, so when it was time to buy another one, this is the first place I looked. The new Nero rail is leeegggiitt. Very aggressive cuts, lightweight, but still solid, and the edges aren't sharp. MAS logos on the upper, rail, and barrel is a nice touch. They even know that 300 AAC in a 1/7 barrel flies best and don't cut corners with 1/8 or 1/9. Fit and finish are spot on, and the rail is tight and lines up perfectly. I'll be back as soon as the wife forgets about this one! Was this review helpful to you?

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Best bang for the buck March 25, 2018 : Steven C   Quite a few options out there when building your AR platform weapon, and I like MAS Defense as the best balance of quality and cost. It is in my opinion the most cost effective option. Was this review helpful to you?