I want to switch barrels and I want to run iron sights. A barrel is available to me that previously had irons. Can I screw it on to the point of correct headspace and then screw it further on until the sights are in the correct position and then just ream the chamber back to correct headspace? Is there a limit to how far I can go? I imagine at some point I'd have too much barrel sticking into the receiver, but I've never messed with this.

Thanks!