Nolehoe

I am not sure what you areasking but converting the "rock" to a "cap gun" is pretty staight forward.The inletting in thestock for the"rock" is the same as the one for the "cap" lock so get a new/used"cap" lock and drop it in... The GM replacement barrel should also drop in place - essential... there might be some slight adjustment necessary.

Next depending on what you are proposing to shoot - get the correct twist rate.... I personally would get a 1/28 twist for both conical and sabot, but I would be giving up round balls.... The 1/48 is a happy medium for conicals and round balls and it will shoot sabots. Slow twist for PRB's only...

Hope this makes some sense...