Springfield bolts,and modified springfield bolts,should be easy,and not expensive.
I noticed in the Midway #35 catalogue,the brand new one,they have those direct replacement Criterion Springfield barrels,finished(the pic looked like it may have been parked,hard to say) for about $265.
It will have the right threads and profile.
Likely there are still a few new military barrels around,try Gunlist,Shotgun News,etc.Sarco,Springfield Sporters,J=G,all those big ads.
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