Quarter Circle 10, THE AR Pistol Caliber BRAND. Leader in top of the line, dedicated AR15 Pistol Caliber parts. .40 S&W Glock Style Bolt Assembly Advanced blowback design
Manufactured to function reliably with Glock .40 S&W, .357 Sig, and 10mm magazines
Drop-in Installation
8620 Steel Bolt QPQ Nitride treated for maximum durability and wear resistance.
Heavy Duty Extractor Removable mass 15 oz assembled weight.

DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.