 a Glock 37 chambered in 45 GAP. The round itself never quite took off. Now it was produced in 2003. Glock wanted to compete head to head with the 45 ACP and for a while there they did. It is a 200 grain bullet opposed to a 230 grain bullet but the idea was to increase the energy and make a higher pressure round that competes with the 45 ACP and even more so, they wanted this 45 GAP to ballistically achieve what a 45 ACP does plus P. Enjoy the round, they think it's a great round. It's a short, fat round, a higher pressure round, you know, is beneficial to law enforcement or anybody who's gonna use it for self-defense.