Hi Sandbagger,
Do you have the Russian version with adjustable sights? If so, this gets trickier. To be imported to the US, the Russian Maks had to have adjustable sights installed. The fellow that milled the Russians used a piece of bar stock as his gauge, and did the milling by eye. As a result, there are wide variations in the depth of the step cut to accomodate the adjustable sights.
A good gunsmith can fit a replacement sight to the Russians, but it's expensive. Makarov.com offers replacement, do it yourself fixed rears, but you may have to shim them (I did) to get vertical POI=POA. I had Makarov.com put on the replacement fron sight and it's great, but the rear was a headache. I'm still thinking about just buying a Bulgarian and using my Russian as spare parts. I hate to give it up, because it has never failed me.
Be well.
Scarface