Arrow Barrel Sleeve, for Crosman & Benjamin

thingiverse

For shooting arrows from a Crosman 13xx/22xx air pistol or rifle with a steel or aftermarket breech, or a Benjamin Marauder pistol or rifle with a 7/16" barrel. These reducing adapter sleeves allow the installation of a 6mm OD arrow barrel into the 7/16" breech opening. 1. Choose the .177 or .22 sleeve depending on the caliber of your gun (bolt probe size). 2. If needed, clean up and sand outer surface of sleeve to remove irregularities to fit breech. Ream inner diameter to fit the 6mm tubing snugly. Clean up the transfer port opening. 3. Insert sleeve into breech and check bolt closure. If needed, remove sleeve and chamfer the inner breech end of sleeve until the bolt closes and seals properly. I turned a Philips screwdriver bit against the sleeve opening until the bolt O-ring seated properly. 4. Apply epoxy and press arrow barrel tubing into front end of sleeve until it bottoms against the inside shoulder. Remove any excess epoxy before it sets. 5. After epoxy is dry, install arrow barrel assembly into the breech in place of the existing pellet barrel. Line up the transfer port opening, if applicable, and file flats on the upper portion of the sleeve at the screw marks if the fixing set screws stand proud. See https://www.thingiverse.com/thing:3265230 for arrow barrel tubing and arrow specifications and additional parts. Benefits from an upgraded valve and transfer port, as well as narrowing or removing the bolt probe tip to increase flow. UPDATED 12/8/2018: The new model requires much less work to fit the barrel and sleeve. If you downloaded the earlier version, please discard and use this new model instead.