Suck ! Just a little rant and FYI. Got a full body and thin one both with the bolt catch. 1 made it about 50 rds and the other made it almost 200 rds. Both blew the top back side of the Mag out. So i showed the boys at MAS and they swapped them out for some without the bolt catch. 200 rds later the full body is splitting at the screws. So they got me some CMMG mags! Problems solved! These things are well built, prob put 2k through one this past weekend and it shows no sign of any wear!