Can be done, with the right tools. Cutting and re-crowning has been done a million times already.
But 555 and 517mm are really, really long barrels. Are you sure your gun has enough cylinder volume to push that?
What's the base gun, what's your FPS?
But 555 and 517mm are really, really long barrels. Are you sure your gun has enough cylinder volume to push that?
What's the base gun, what's your FPS?