I use a T/C Contender carbine. I got a custom 17” .22lr barrel. I put a Weaver .22, 2-7X scope on it. The Contender breaks apart at the hinge pin. You take the two forearm screws out and then you can slide the hinge pin out and the barrel lifts off. The Contender is very accurate (CCI Silhouette MiniMag 0.58” five shots at 50 yards.), has a great trigger (Mike Bellm), and is light weight. In my hunting experience you get one shot and then everything scatters. I also have a 21” .223 barrel that Mike Bellm rechambered for me. It will shoot under an inch all day long. On a good day it has shot under ½” (3 shots at 100 yards). A Contender pistol might be even better for a BOB weapon.