Steel Breech Upgrade for Crosman 1377 & .177 Caliber Pistols

Upgrade your Crosman 1377 or compatible .177 caliber air pistol with this precision steel breech kit. The Crosman 1377 ranks among the most customized air pistols available, and this DIY breech replacement is the perfect starting point for your build.

Enhanced Performance

Installing this steel breech delivers improved accuracy over the factory setup. The upgrade accepts both standard-length barrels and extended aftermarket barrels—check our Accessories section for barrel options.