Amazing customer service, there was a "miss ship" issue but that was more likely USPS. Biggest issue is the barrel nut on the ar upper I purchased was torqued WELL OVER 100 foot pounds. I've still yet to get it OFF!! it's crazy at this point I'm afraid to bend the upper!
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Great upper, but old style barrel nut
February 8, 2023
:
Micheal Austin from Blaine, WA United States
It's a great barrel and upper, the compensator and BCG it came with are super nice. However it comes with an old school barrel nut for Delta rings without a Delta ring installed and the type of barrel nut that most floating handguards Do not fit. because of this I have to take the barrel nut off and do a bunch of smithing to switch out the barrel nuts in order to put a hand guard on it. -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- MAS Defense Reply: Mike, you ordered the 16" 5.56 / .223 AR-15 BARRELED UPPER - MAS DEFENSE MIL SPEC BARREL NUT. The title and description specifically state it comes with a "Mil-Spec Barrel Nut". This is also shown in the pictures. Most handguards come with their own proprietary barrel nut. I apologize for the inconvenience. Thank you for your business and your feedback!
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Looks Good
April 14, 2022
:
from MN
Everything came exactly as I ordered and was put together well. Parts seem high quality and will be tested thoroughly.
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Well worth it
June 16, 2021
:
Peter Hutchins from Tulsa, OK United States
Had a little trouble getting the barrel nut off but other than that, it's top notch.
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Good upper but....
April 6, 2021
:
Pat Henderson from Gray, Tennessee United States
Bought the upper with no rail. Whoever assembled either used lok-tite or severely over torqued the Allen heads in the gas block. I had no choice but to drill them out so I could take it off to mount the rail. Could have been worse, at least I was only out a $5 gas block. Thankfully the barrel nut wasn’t over torqued. To be fair, Mas Defense is my go to for complete uppers. Maybe just got one from a dude who was having an off day. Won’t stop me from buying again. --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- MAS Defense Reply: Pat, I apologize for the issue you experienced. We torque the gas block set screws to 40 INCH LBS and use a blue removeable Loctite. They are installed using pre-set torque wrenches to make sure they never move. We have found applying heat to the block before removing the set screws makes the job much easier. Thank you for your business and your feedback!
Barrel nut 
Looks Good 
Well worth it 
