These 30 round Steel Magazines will fit your .45 ACP MAC-10 SMG and Master Piece Arms .45 acp guns. They are very durable and we have noticed very little wear on the feed lips after thousands of rounds. They are NOT Notched for the magazine catch to fit the Mac-10 .45 ACP. Please Call if you have any questions or need measurements to figure out which Magazine fits your gun. An unmodified magazine should measure from the top of the back of the feed lips down to the magazine catch, just a bit over 3.75 inches, almost 3.875 inches. Please see photo under the notched/modified .45 acp magazines for photos. Coating and finishes may vary between magazines.BACK ORDER ONLY-AVAILABLE 10/13
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