A bit of info on a norinco mak-90

King Sports Imports. made in 1993 as a 'sporter' for export to the U.S. by Norinco which was a Gov owned arms company.
Dull stainless bolt & carrier. Chrome barrel. 1.5mm receiver, later version blued steel, neutered front end..but still built to last forever! If it still has the original chicom double hook FCG, they are far smoother than most, no need to upgrade there imho.

Agreed with the above regarding 99% chance its a slant cut (rear of receiver under the trunnion) so if wanting to convert back to original configuration (chu wood stock set) its going to be a real challenge...

The only entity making slant cut wood stocks for these is Ironwood, but they are in birch wood w/ orange tinting but have similar cut, angle, etc as originals, its close but not exact. Butt-plate on the IWD stock is ribbed or rubber, which is way wrong for both if wanting originality, but anyway...

Ironwood Designs Premium Military Rifle Stocks MAK90 T56 Stamped Angle Cut Stocks <

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Its a great rifle, becoming harder to find and certainly climbed in value past few years. It'd be even better if brought back to a more conventional configuration of wood, green canvas sling ( amazon), matched with chinese flat back mags, green canvas chest rig, etc.

HackerF15E said:

It isn't really a "challenge". A 56S stock fits just fine, there's just an open gap where the receiver cut is.

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I guess I'll repeat what I wrote:

"if wanting to convert back to original configuration (chu wood stock set) its going to be a real challenge..."

which implies bringing the receiver back to "square", ya know - fitting & welding a correct piece back in, blending, refinishing to match the correct bluing so as to be undetectable - so one could reinstall the correct original chinese chu wood stock set. That pesky original configuration, as they were cut to further comply with the AWB work-around of a 'tarded thumbhole stock.
That's going to be challenge to many owners in either skill or cost. Real Chu-wood stock sets alone are close to $500-700 if you can find one!
That "gap" looks like ass, BTW. Never said a standard stamped rec stock wouldn't "fit", but if that's the acceptable 'look', Op could just hammer a chunk of 2x4 into the rear and call it a day!