This is a steel chamber adapter that allows you to shoot 22RF in a 22-250. I have never used it, though I have had it for quite a while. To use, drop a 22RF round into the adapter, then insert the base plug (this has the RF firing pin on it) insert in chamber and fire. $30 shipped. I do take PP.
Last edited by hackleback; 03/26/20. Reason: spelling