Just received my 8.5" AR Upper in 300 Blackout. This thing looks awesome, solid and quality as well. First time buying from MAS Defense and have to say I'm very impressed. Now I'm very excited to build my next AR15 and can't wait to buy all the other items for my upper and lower to complete this build! Thank you MAS Defense for an awesome product!
Sincerely, Juan Lopez
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March 1, 2023
:
Robert Bishop from Marysville, OH United States
Excellent costumer service, great product, fast shipping....I will definitely shop here again!
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300 blackout upper
December 2, 2022
:
from Monroe , NC United States
This is not my first purchase from MAS, won’t be last. I have been a customer for years. The upper was as I expected, assembled well, fit and finish were top notch. The attention to detail has always been on point with MAS.
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Will send Freedom Seeds
November 11, 2021
:
Sean P from MD United States
Looks awesome and fits great! 10/10!!
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Awesome transaction!!!
May 21, 2021
:
Douglas Wright from Baltimore , MD United States
Fast shipping - you had exactly what I was looking for!! Muchas Gracias!!!!!!!
300 BLACKOUT 8.5" AR UPPER 
