Shop › MAG HK USP-FS 9MM 15RD MAG HK USP-FS 9MM 15RD $54.99 Heckler & Koch Magazine, 9MM, 15 Rounds, Fits USP, Polymer, Black, Red Follower 50248609 Quantity: Add To Cart Added! Heckler & Koch Magazine, 9MM, 15 Rounds, Fits USP, Polymer, Black, Red Follower 50248609