Re: Leupold dual dovetail base screw Question/Help-
Just remove the bolt and do trial by error. The shorter ones will probably be for the front base due to the barrel threads as was already stated. Put the longer ones in the rear base and see if they protrude down into the receiver. Most likely they wont. If you put the longer ones in the front base, the front screw will probably bottom out before it secures the base down and you'll end up stripping threads in an attempt to tighten that base down. Watch for the clearance of the rear screw on the front base. That screw, if too long, can interfere with the left lug when the bolt is closed. Basically, trial by error while watching for which screws give you good thread engagement without sticking through and causing a problem.