CUSTOM TRANSFER SLEEVE for Crosman 13XX, 22XX & Discovery
This custom steel transfer sleeve is the part you need for magnum-powered airguns. It helps correct misalignment of the ports caused by manufacturing variances and increases air flow for more power and consistency. The inside diameter is about .150 to match the Discovery, 22XX and 13XX valve ports. These are the sleeves I use on all my custom builds, the reliability and performance is absolutely unmatched. Other types of custom transfer sleeves simply don't work as well, this type seals tighter as you put more pressure in it. It fits your original rubber gasket, valve and barrel, no modifications are needed to use it.
It fits 1377C, PC77, 1322C, P1377, P1322, 2289G Backpacker, 2240, 2250B, 2260, 2300T, 2300S, Benjamin Discovery, Crosman Custom Shop and other related models. The photos show the custom sleeve on the right compared to a stock sleeve on the left. The custom sleeve is chamfered on the inner edge of the valve side to smooth air-flow.
It will not work with the older 1377, 1322, 1400 or similar models that have a sliding breech cover.