I messed that barrel up. 45 and 10 mm are totally different. I think the throat stuck out to push the nose of the round up, but the timing wasn't consistent. Brownells has a fitted Nowland barrel, bushing, and lug for it. And a new mag spring. Realized the follower is different on the 10 so probably I'll keep it for now.
Order a bunch of parts from Numrich this morning for an old Springfield 87A gill gun that belonged to an uncle then cousin who have both passed on. I have a handful guns that belong to them, couple need some work.