you don't NEED to be fussy as far as mags are concerned- i've got some 36 of the things and some click right in, some need a little "encouragement" depends on what mag and what rifle- being an old hand with the '14, i prefer the 5/20 mag- it's what it was designed for/came with /works properly, and gives you a decent something to hold on to- besides, you USED to make better deals on a 5 pack of 20s than one 5 round mag from springfield- i got my 5 rounders when ms campbell was going to "limit all semiautomatic guns to 5 rounds" before i found we could pin our standard capacity mags- well, they sit in the junk box- these suckers sit flush with the stock and you need a blade screwdriver ( and not the one in your buttstock tool kit) to get them out-anyway, some of the best feeders( which is what a mag is SUPPOSED to do) are MARSTAR'S 5/20 NORINCO mags- the ones with the "W" follower- with those, you can pry off the floorplate and CLEAN the inside, which is something that is hard to do with some pinned mag- moreoever, you DON'T HAVE A RIVET gouging the heck out of the magwell
oh yea, and the 5/20s are usgi, some norinco, and some i have no idea where they came from- if you can, get usgi - then norinco, then springfield- the norc "clicks" in better and you've got more of a grip- i've had to "modify" more than a few springie tubes on the backside to get them to latch