True, that's why I suggested there might already be a locator pin hole in the backstrap. Only problem is I have never seen a Pietta Great Western II with two piece grips. I have four, all solid. Their catalog shows no two piece grips. Heritage shows replacement grips for their .22s, but no optional grips for the Rough Rider. Most people actually pay more to get the one piece grips, but to each his own. If it is simply the look the poster is looking for, you can buy a screw and the brass inserts and install them on the one piece grips.