I think the sleeve was fairly common. Ive seen them on SR Griffin rifles and several unknowns. Probably available from stoeger or somesuch.

They seem to go away around the time Sporters were available from the armory. 1922-23 if I recall? Maybe if the spline cut bothered you enough to put a sleeve over it you just ordered a barrelled action without the cut?

Last edited by bsteele; 04/29/19 10:37 AM.