Screw Receiver 01 Long Tube 23/64-ID External with Extended Barrel. KVAX01LXL for Kval 6-shooter on 990-FA, 990-FX, 990-F3 and 990-F4, 994-X, 990-H, 990-HQ machines.
The long KVAX01LXL [tube only] is 5" in length, and 1-5/8" from the base of the tube, to the center of bend.