MasterPiece arms Defender 9 Factory gun magazine. This magazine is made from high strength polymer and uses a metal roll pin to keep the floor plate secure. The spring is made from heat treated high tensile strength steel. This polymer magazine is made for all MasterPiece Arms 9mm pistols and rifles. It is available with a capacity of 10 or 30 rounds. The 30-round
model is made to fit any MPA gun with a Serial # which starts with B or F,
as in B1234 or F5678. With older model guns, a slight modification to the
mag may be required. Orders shipped within 24 hours except for week-ends and holidays.