Does not work with the bear creek arsenal 9mm upper assembly. - Mean Arms 9mm Ejectored EndoMag - 3 Pack

Even though BCA has reviews that this will work with their 9mm upper assembly. Bear Creek Arsenal redesigned their Bolt Carrier Group which does not work with these Endomags. They kept the same part number and reviews but like I said, changed their design. Sort of bait and switch to sell their uppers so I can't blame Endomags. I wished they would work with the BCA upper since I like the look of these mags in my AR but I ended up buying the Stern Defense MAG-AD9 AR-15 Glock 9mm adapter using Glock 9mm magazines and Magpul 9mm magazines. Took to the range and it ran fine with the Stern Defense Adapter.