MAS Defense Uppers

I have no experience with them but judging by their specs on the website I would stay away. Most of the uppers are equipped with Chinese hand guards. I doubt that is all that is imported. Looks like gun show parts uppers to me. GH
 
I used to work with MAS, They do sell "economy" versions of hand guards but that is for people who want an affordable Free Float. They also carry Yankee Hill, Troy, Spikes, and Seekins. Also all of their Barrels, Bolt Carriers, Upper Receivers, Etc.. are 100% made in the USA. Their customers are very happy with them they have over 1,000 5 star ratings, but ultimately if you have any questions or concerns just give them a call and they will help you out.