Crosman steel breech kits from Airgun Revisions is an upgrade to the standard 2240SBPK kit and it is now a Multi-fit application. Breech has both front and rear position #4 screw size. Kit also includes Metric screws and wrenches as well as the original SAE sizes. Airgun Revisions has also eliminated pellets catching on the #4 screw counterbore by blending the sharp leading edge. This means no shims required. https://www.airgunrevisions.com/product/crosman-22-breech-kit/
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