FN 57 Magazine 10rd Extension Kit

We have FN 57 Magazine Extension 10rd For Sale! This is a high-quality mag extension kit made by CMMG. You simply remove floor plate, install extension, insert spring and put the floor plate back.

In stock


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American Owned and Operated


20+ Years In Business

Returns Accepted

Ships from Pennsylvania


Installation takes only seconds and does not permanently alter factory magazine. Chrome silicon spring is salt water resistant and will not take a set. This is a great FN57 Accessory for your FN 5.7x28 Pistol.

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Customer Reviews

Great product
Review by Ken
Verified Buyer
I love my CMMG Five-seveN magazine. No problems whatsoever, and the 30-round capacity is exceptional.

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