Yep, POS about .060 too wide to fit. I filed it thin enough to fit, but by then the shitty plastic tab on the front that locks into the trunnion was so worn out, the bullets ran right into the trunnion and did not feed. I got it to work by fabricating brackets and using an old Arsenal .223 10 rounder as a feed tower. It has METAL locking surfaces and I did make a guide plate that helps the bullets trasition into the mag. I could have the same results if I just started with the regular crappy Beta knockoff for the AR, and have a drum that I could switch between systems. this thing is total