About 10 years ago I bought 4ea. 20 round M1 Carbine Magazines and I have a question about them. When I got them they didn't have the stiffener that slides up into the mag well, they had the lock spurs but not the stiffener. I made some stiffeners out of stainless and JB Welded them on. Took them to the range to see if they would hold and they held. I shot about 30 rounds from each magazine. I bought them for about 3 bucks each and I think they were fakes. Has anyone here ever seen an M1 Carbine without the stiffener, just a smooth side opposite the lock spurs? They might have been made for some other kind of rifle, just wondering. Since then I have acquired 4 ea. 30 rounders,2 ea. 20 rounders, 4ea. 15 rounders and 8 ea. 10 rounders. I will use these until they break, what do you say? Guess the worst that could happen is they fall out of the mag well and then I will trash them except for the base plate, follower and spring.