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CMMG FiveseveN Magazine Extension Kit Adds 10 Rounds Polymer Black 57AFD1E

CMMG, Inc.
Typically ships within 1 to 2 business days.
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This CCMG magazine extension kit includes a spring and magazine body extension for your FN FiveseveN, increasing capacity from 20 rounds to 30. Magazine body extension is durable polymer, and matches the contours of your existing magazine. Magazine spring is corrosion resistant steel, ensuring reliable function for years to come. 
Item#: 2-CMMG57AFD1E
Total number of Reviews: 2

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1.0 5
"Sorry to say, of the many, many things I have purchased from CTD, this does not function well, but it is no fault of CTD. I bought the 10 rd. extension and the 30 rd. mag, and both have a tendency to cause jams when shooting the first 10 rounds. Seems like the spring just cannot handle the extra rounds. I shoot 200 rds. through this gun each week and can't remember the last time it jammed with the 20 rd. mags. Still might be fun for the range if you don't mind clearing jams."
5.0 5
"Easy to install works great have had two of them installed for at least 3 years Shoot on the avg of once a month. If you all ready have an FN mag 20 round its a great way to get an inexpensive 30 round"