Speaking of, say you can just barely squeeze six rounds into the magazine, but the sixths often pops out, it's pretty clear that its only intended for 5, but it does accept the sixth round. Will that be ruled as prohib? And how can you modifiy it so that it won't accept that last round?
I believe with mags with spring followers you take the floor plate and spring out, flip it upside down, put 5 rounds in (with the follower still in) and make sure it is all sitting flush like a normal mag. take a piece of doweling and measure from the bottom of the mag up, then measure the same distance on the outside (leave a couple of mm for the 1/2 round) and put a rivet in the back of the mag.
I believe with mags with spring followers you take the floor plate and spring out, flip it upside down, put 5 rounds in (with the follower still in) and make sure it is all sitting flush like a normal mag. take a piece of doweling and measure from the bottom of the mag up, then measure the same distance on the outside (leave a couple of mm for the 1/2 round) and put a rivet in the back of the mag.



























