UTM’s Pistol conversions and conversion kits are designed and engineered for the upmost in safety, in-service reliability and maintainability. The conversions and kits are easy to install, typically a simple exchange of the manufacturer’s barrel or slide assembly is all that is required. UTM conversions adapt the host weapon to fire UTM ammunition with the feel and function of “live” ammunition.
This is the Barrel Only (MMR/TBR). This kit does not have a different spring, you should use the original spring in your Glock.