Id bet dollars to donuts it is a 0.311", which is perfectly fine for shooting 0.308" pills. With the cheapest 7.62x39 barrel on my AR15 i could find was shooting 0.75moa all day long at 200 yards using 0.308 150gr nosler ballistic tips.
PacNor can make you any barrel you want.
XCaliber will too and is a touch cheaper than PacNors option
PacNors is top notch. Ive heard Xcaliber is goos too customer service wise.
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