What braniac carries ANY pistol completely dropped inside of the front pants pocket of their trousers? Do you know how FAT you'd have to be to not have even a small pistol show up? That or maybe you're a Moslem female wearing a burka.
You'd also have to have sizeable pockets just to conveniently get your pistol out with not snagging. You your modify your pockets, but then you'd have to modify all of your pants unless you were a dirtbag or a hobo and just wore the same pair all of the time.
Having the pistol completely in your front pocket like that is total clusterf^ck and bespeaks of someone who's only 'thought' about it and never actually tried it in day to day use in the REAL world.
The fact is that the Mak is a superb carry pistol, safe, tough, utterly reliable, an decently potent, especially with 115gr ammo.
For REAL pocket carry in a pair of jeans, the Mak is perfectly sized in that the grip is readily available, especially with an Uncle Mike's 'slipper' style holster. With a shirt that can cover the grip, the weapon doesn't print at all.
An M21? You're almost better off with a good knife, like a Cold Steel Tanto, in a side mounted sheath in the small of your back.