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AR57 16" Complete ULT M-LOK Upper Receiver 5.7x28 Caliber With BCG, Muzzle Brake, M-LOK Rails and 1-50 Round Mag, D
CMMG 57AFD1E Magazine Extension Kit Adds 10 Extra Rounds for 5.7x28mm FN Five-seveN Magazines
Smith & Wesson M&P 5.7 Magazine 14403, 5.7x28mm, 10-Round Capacity
ProMag FNHA10 10-Round 5.7x28mm Magazine for FN Five-seveN