This mount is used to add an RMR Micro Red Dot Sight to the Crosman 2240, 1377, 1322, 362, 3622, etc. It has a unique clamping systems that uses a machined steel collar inset into a nylon base to clamp very securely to the barrel using the optics mount screws. It is compatible with the plastic and steel breech. It is the only optic option, that is low enough to be used on the 362, 3622, and 1399 stock without a cheek riser. This RMR base is low enough that you can co-witness with the front sight on any of these compatible Crosman airguns. On the 3622 you'll want to remove the cylindrical guard from the front sight. The Nylon Base is proudly made in Texas, USA by a veteran-owned business. The steel collar is, unfortunately, made in China. Both parts come with a Lifetime Warranty. Youll need to buy the red dot separately. We designed this mount to work perfectly with the Leapers UTG OP3 RMR Micro Red Dot Sight. If you go with a different dot sight youll need to make sure is is compatible with an RMR base and 6-32 screws should be included with your MRDS. If not, you'll need to source the screws separately.