the pmags work, plain and simple... some will say that if dropped on the feed lips, they can crack off the feed lips. yup there is that chance, but drop a USGI mag on the feed lips and it wil definately dent, and then its even more useless then the PMAG with a cracked feedlip. I watched a PMAG at the range get loaded and fired 5 times with 3/4 of one of the feed lips completely gone and it fed and fired every time, 150 rounds with not a single jamb. On the other side, Ihave had USGI mags that looked perfectly fine, but would jamb everyother round, so thats why i sold off all my 30 round aluminum mags and bought a stack of PMAGs.
your son will thank you for them, and thenk him from me for putting his ass on the line.