If your buying a Cammenga 20 rnd Easymag anytime soon, make sure you put it in an AR before you pay for it. Or else get ready to maybe have to ship it back to Cammenga to get a new one. Apparently the last string of the new 20rnd Easymags tried to get the specs on the feed lips as tight to the bolt carrier assembly as possible, and were made just a little too tall. They WILL NOT snap into your AR if it is an out of spec one, and you shouldnt try to hit it hard or force it. Cammenga has excellent customer service, I shipped one back to them today, and apparently will be recieving a new mag, plus some extra goodies for my trouble. The guy I talked to said that a very limited amount have been turned back in so far, only 4 before mine. But thats not to say that more arent out there waiting to be bought. Just wanted to give you all a heads up.