NM M1A Barrel thread

[Animalmother]

Would a standard (22" 1-12 twist) barrel fit on an M1A NM receiver? I'm sure the op rods are different, but I'm not sure about the specs of the barrels. I'm very much a novice when it comes to M1A's.

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[jmoore]

Op rods and barrels will swap willy-nilly. Even heavy barrels use the same op rod, though the guide is often a different width as well as being H.B. specific.