These magazines are made of polymer or metal depending on the gun and caliber. they have a capacity of 30 and 35 rounds also depending on caliber. The 45 caliber mag is made for any gun with the Serial# starting with A as in A1234. The 9mm polymer magazines are made for all 9mm pistols and rifles, and the 22LR magazines are made for MPA22T, MPA22T-A, MPA22SST-A, and MPA22SST.
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