Home / Handguns / Glock 21 Gen 4 .45 View cart “STI Duty one 4.0 9 mm” has been added to your cart. Glock 21 Gen 4 .45 SKU: - Category: Handguns Product ID: 1601 Additional information Additional information Brand Glock Model 21 Gen 4 Caliber .45 type Full Size Related products Out of stock CZ Shadow 2 Black 9 mm CZ Shadow 2 Blue 9 mm ฿000 Out of stock STI Off Duty 3.0 9 mm