Must have for 3-gun competition
I have used these in several 3-gun competitions and quite a few practice sessions now. The magazines I have installed these on have functioned flawlessly thus far. I have one installed on a "GEN M3" 40-round magazine and two installed on "GEN M3" 30 round magazines. You can get 35 rounds in the 30-round mags and 46 in the 40-round mags... but you cannot seat a 46 round mag on a closed bolt. So they effectively hold 45 unless you insert on an open bolt and strip the first round as it closes. Also, make sure you take the plastic tail cap off of the spring before you put this extension on or you will not be able to get the magazine back apart and it will hold less rounds than stated. The bare spring should be in contact with this aluminum extension.
