Lower cost, gets the job done.I carry FMJ “ball” in magazines, as it has fewer FTL’s.
I have those same bands.I found these elastic bands for the magazines and a receiver decal at Amazon to help me avoid loading .223/5.56 in my 300 blk out and vice versa.. One still has to pay attention to what you're doing tho.
A bit of comic relief, and a great song from my youth, in that film: