Originally Posted by
huntsika
Why not simply rechamber to 303 British - which will be moreorless the correct bore size (.310 v .311) and, I expect, be better with a modified Baikal extractor (given it is a rimmed case you will not need the silly little spring loaded pin that is on the 7.62x39?).
Or buy a whole new gun as others have said for the purposes of swapping barrels (but would still pay to check head space and I am not sure Baikal engineering is sufficiently accurate to allow fore-end/attachment etc to swap straight over?)