On the next buld you might do some more research on the school /builder of the gun you are trying to represent some little things consderd not to be common/correct may be the signitutre of some areas/ builders there may be a school or builder who regularly used a screw at the rear of the trigger guard, none I know of but just an example, you will see many done this way in many atreas in RCA 1&2, nice work keep us posted as you continue.