Awhile back, I bought a barrel labeled "Enfield sporter" online, sight unseen, thinking it would be nice to have a spare and that it was a shortened 303 that had been taken off a No 4. When it got to me it turned out to be something completely different. It has no markings and uses a Savage style barrel nut for attachment and headspacing, but it does thread into a No 4 receiver with no problems. It's not 303 though - after some testing with different headspace gauges, it appears to be 7.62x39.

I'd love to actually use this on a rifle, even if it's only a single shot with no magazine. I know No 1 and No 4 barrels can thread onto either receiver, although there are some minor differences in the threads. The front sight on this barrel ends up at 2:00 when properly headspaced in the No 4 receiver that I have. Is there any way to tell if this was meant for a No 1 or a No 4 or doesn't it matter?

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