The MAK-90's are generally recognized as pretty decent AK's made by Norinco. The MAK's were imported "post-ban", and the modifications (hence "Modified AK") were such that the AK could be imported notwithstanding the ban. Many of the MAK's were actually in the production/import pipeline and thus the modifications appear ad hoc, while those produced later in the ban are essentially production AK's.
Norinco AK's are ChiCom, and while less prized than a true Soviet AK, or a Galil, or a milled Norinco, still rank high compared to many other varieties.
Here's one resource:
Chinese made AK47 Varieties
Here's another:
Untitled document
And:
The AK Page of Drzero.org
Don't change a darn thing on the MAK without thoroughly understanding the 922 rules either! You would not like jail!
Here's a tip that you should know:
Just remember to STAY AWAY from MAK-90 rifles imported by the importer "Le Banu" of upstate New York, (but NOT ALL MAK-90 Rifles, as some will incorrectly infer), that are marked with 3 position fire-control selector markings (sometimes in Chinese characters, other times with the letters "L and D" for the 3 positions on the right side of the receiver), as the ATF classifies these as "ILLEGAL MACHINE GUN RECEIVERS" with, or without the receiver being drilled for a 3rd axis pin!
Also of interest, the Military Defense Council of Finland, selected Norinco of China to supply Chinese type 56 AK-47 rifles, which are virtually identical (except for select-fire components) to the Norinco MAK-90, & without the MAK-90's thumbhole stock). Also note, the GALIL AK's, F.E.G.'s from Hungary, Arsenal of Bulgaria, and Russian AK's were all tested against the Chinese Norinco, and the Norinco came out on top as the most rugged, and best value DUE TO THE USE OF THICKER 1.5MM STAMPED CHINESE RECEIVERS, DOUBLE-HOOK TRIGGERS FOR SMOOTHER TRIGGER-PULL, and thicker Chinese barrels, and despite the fact that it would have been easier for Finland to buy AK-47 variants from other Eastern European, or Russian sources, they bought Norinco's.
Anyway, you have to sleep at night, so don't ask us to rationalize or criticize your deal.

I'm just telling you some facts........
And, I shoot the heck outta mine. Totally. What good is it if you don't? It's
not like a milled Soviet NIB or NIB Galil, so don't fret about appreciation, LOL. Here's mine, absent that POS thumb-hole stock, etc. This is why I know a lot about 922 too - don't change a thing without understanding 922. Do not underestimate the ATF either.
Mainly because it is a Chinese knock-off of the original Kalashnikov AK-47. Steel could be inferior, parts may not be made to exacting precision, etc.
Simply put, It could blow-up in your face.
Very doubtful, very. An AK produced and made in Somalia, maybe; A'Stan, probably not,
a Norinco, no, only if a total and complete aberration. Few if any AK's are made to exacting tolerances. That's what made them so damn steady in the field, and so easy to produce.
That's why the AK outnumbers any other weapon in production in the world.
Check your PM's too, Excel22.
Gunbroker has MAK-90's from about $400 to about $800, BTW.