One of the great military revolvers. Had a 4" Mk VI and did shoot a few animals with it. Also had a genuine 22 Long Rifle rimfire adapter kit for it. A 22RF drop in replacement cylinder and a 6" barrel that locked into the 455 cal barrel. The 22LR barrel protruded on my 4" MkVI but a short spacer made up the difference (looked a bit like a silencer. The 22 RF set up shot well, extracted and ejected just like the 455 cal.