The odd measurement bothers me more than the tiny bit of space betw the tubes.
The lack of a steel spacer (Keel?) makes it look empty and cut, then filled in w/solder.
Certainly an awfully worn look for the face of the muzzle and nice dent or punch mark in the middle of it.
Those tubes are awfully thin at the muzzle,,but yes some are I suppose.
Is that an early Remington front sight bead? the little mushroom style..Seems like all my Model 10 pump guns had them.
Pitted surfaces, maybe buffed at one time (maybe just out of focus pics!), damaged muzzle edges,,,,I'm not so sure.
Stuff like that is best to examine in hand.
