I just purchased a bag of three of the ss mag followers. I assumed they could be put into any AR15 mag. But I opened up my Colt 20 round and it has a flat spring steel riveted into it so it Ls into the mag bottom to catch the floor plate. There is not way to get the follower into the mag without bending and possibly breaking it. I put them into my 30 round mags and they work fine. But I don't think there is any way to put them into the mag with out breaking it off or bending it up. Anyone else tried this? The problem is I get the rear of the case that will sit just about a sixteenth of an inch down and the bolt will over strip. I have black plastic followers in the colt 20 rounders. Any help appreciated.