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You do realize that a pistol has more recoil then a rifle because the force is the same (for same round) and it's spread over a lot smaller mass?
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I'm not sure exactly what your trying to say but none of the ways i can interpret this are correct
Pistol have higher recoil then rifles: really depends on the pistol/rifle, mass comes into play only in the fact of mass of the gun vs the force of the bullets explosive charge (minus any recoil absorbing equipment in the gun)
Pistol rounds and rifle rounds are drasticly different, pistol rounds are heavier with much less powder, and the powder is really what matters when it comes to determining recoil.
Submachine guns (which is what i was talking about i don't know why your quoting me and then saying pistols) have a much higher mass compared to its ammunition then rifles. The MP5s that the police use have very little recoil.
As for a shotgun slug having the same power of a 20mm minigun system I don't have any personal knowledge of that but Its highly questionable, considering the recoil would probably break you shoulder if not do worse. considering a .50 cal is 12mm and used in a rifle has been known to cause shoulder injury to shooters not trained for it, a 20mm which is almost twice as powerful should not the same as the gun most commonly used by least trained of shooters (slug shotguns are the favorite weapon of the casual sportsman.