Shop › MAG HK USP-FS 40SW 13RD MAG HK USP-FS 40SW 13RD $54.99 Heckler & Koch Magazine, 40 S&W, 13 Rounds, Fits USP, Polymer, Black, Red Follower 50248608 Quantity: Add To Cart Added! Heckler & Koch Magazine, 40 S&W, 13 Rounds, Fits USP, Polymer, Black, Red Follower 50248608