Spike's Tactical enhanced 9mm bolt, finished in black nitride. Runs with either Glock-pattern or Colt-pattern 9mm lowers, so it suits most pistol-caliber carbine builds. Features: Blowback design Black nitride finish Laser engraved with the Spike's Tactical spider logo Compatible with Glock-pattern and Colt-pattern 9mm lowers Fitment: 9mm AR-pattern builds using Glock-pattern or Colt-pattern magazines. GLOCK is a registered trademark of GLOCK Inc. 3CR Tactical is not affiliated with, endorsed by, or sponsored by GLOCK Inc. Any reference to GLOCK products is for identification and compatibility purposes only.