Shop › MAG SHIELD GLOCK 17 +5/4 EXTN BLK MAG SHIELD GLOCK 17 +5/4 EXTN BLK $58.00 Shield Arms Extended Magazine, Glock 17 OEM, 9MM, 22 Rounds, Fits Glock 17, Aluminum Material, Anodized Finish, Black G17-ME-5INS-BLK Quantity: Add To Cart Added! Shield Arms Extended Magazine, Glock 17 OEM, 9MM, 22 Rounds, Fits Glock 17, Aluminum Material, Anodized Finish, Black G17-ME-5INS-BLK