I have a small pile of new 30 rd AR clips (223) came with black follower and had some trouble with the follower hanging up, So I got a few bushmaster mag rebuild kits (green follower, spring, floor plate), but still have some problems with follower sticking. Bushmaster said try some lube, so I tore them down and sprayed teflon spray inside, put back together, put still having some problem with the follower sticking. The clips of alum mil from Twain manufactor.