The best choice of course, is to locate a proper M14 barrel. Failing that, an M15 or M67 barrel will fit no problem. The only difference between the M14 and M15/M67 barrels besides length, is the standard taper on one, and the heavy barrel taper on the other.
If desparate, you can also fit up a barrel from an M19, M66, or M68. But those barrels are even harder to find, and will require shortening the barrel shank and the extractor rod w/center pin to fit.
If really desparate, you can fit a barrel from an M10, M12, M13, M64, or M65 to your frame, but those all need higher front sights to shoot correctly.
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