The barrel appears to have been cut back at the muzzle, the front pipe was relocated back and the original nose appears to have been reused also. The lug missing the wedge may still be there and may be just missing the wedge, I see no reason for it to be removed. The new forward lug may have the original wedge in it and the gunsmith just abandoned the lug missing the wedge. As a gunsmith I would have made a new wedge for the new lug so all of the holes were filled up, but that is modern day thinking. The abandoned hole for the old wedge may not have been a concern back in the day. If you get the rifle and find the lug is still there, I would have a wedge made for it. It probably had one when the gunsmith finished the alteration.