Black Metal Dovetail Groove Breech for Crosman Pump CO2 Pistol 1377 1322 2240 2250..

Specification: 12mm Dovetail Groove, you can install laser sight / scope.

Material: POM(Polyoxymethylene, like but better than plastic) or aluminum alloy

1: Brass type is much heavier than POM type but looks better.