A couple of things more to be aware of: Since the article was written, the procedure has changed slightly, Jim now sets the action in the tube so that the face of the receiver is 0.020" ahead of the sleeve surface. Since we don't use the recoil lug/disc there isn't an issue with that and the slight protrusion may make rebarelling simpler is some instances. Also, in instances where the barelled action already has the lug and is now being glued-in, leaving that small gap prevents any binding or odd vibrations that could result if the lug was somehow not bearing evenly as a result of the bonding.