This FiveSeven 10rd mag extension is the ultimate upgrade to your 5.7×28 pistol. Installation takes only seconds and does not permanently alter factory magazine. Chrome silicon spring is salt waterresistant and will not take a set.
CMMG FIVESEVEN
UPC : 852005002028
Caliber : 5.7MMX28MM
Capacity : 10 ROUNDS
Brand Fit : FN
Model Fit : FIVE SEVEN