Love me some Maks - both the guns and the rounds.
Not all "Maks" are actually Maks. The PM Makarov is a blow-back pistol, inspired my the Walther PP series of guns - particular the Wather Ultra which was still in the developmental stage when the Ruskies liberated the Walther plant. The Ruskies tweaked the design and developed a round that actually worked in it. The rest is history.
Not all guns chambered for the Makrov round are Malarovs. The Polish P64 is closer in lineage to a Walther PPK, the Hungarian PA63 is closer in lineage to a Walther PP, and the Czech VZ-82 is a truly unique development by the Czechs.
The Makarov round is more like a .380ACP +P than a 9MM Luger, and there are no commercially available rounds that are going to meet the FBI's 12" penetration protocol. The Hornady Critical Defense line of ammo can give you about 11" of penetration, and that is good enough for many who do not necessarily treat the 12" protocol as God's word on effective ballistics.
Any of Makarov chambered pistols, with the exception of the VZ-82 are going to give you slide bite and a stout trigger pull. The Polish P43 is gonna give you slide bite from Hay-Deez and a trigger pull running north of 25 pounds. However, give it a 19 pound Wolf hammer spring and a good set of aftermarket grips and it's not a bad little carry gun.
Any of them are a hoot to shoot. The ammo isn't unreasonably priced, but you will have to go on-line to get it. The accuracy is outstanding on any of these guns, but that's a reflection of their straight blow-back designs. They're all built like tanks, are a breeze to field strip and clean, are uber accurate, and are boringly reliable. They're inexpensive, but the prices are rising. If you can find one - any Makarov chambered gun - for $250 - $300, then buy it while you can.