washers or bushings should never be used with square threads...
you loose the crush at the shoulder, it removes some safety from the weapon as well.
no such weapon as a P17, m1917. sorry one of my pet peeves. lol
barrel was likely roll forged rather then hammer forged, all 1917 barrels were hammer forged.
shims and bushing were common use on V threads. this rifle is correct having it...just wanted to clarify the safety issue with anyone thinking they can do so with the scrap barrels that have had the cut at the shoulder for removal.