not taking machine pistols into consideration...the SigSauer P226 Blackwater Tactical holds 20 rounds plus 1 in the chamber (21)
probably If the pistol is designed for 9mm Luger, 9mm Para, or 9x19, yes.
The 9mm pistol would have the higher decibel rating.
9mm Makarov is the caliber of the pistol. To answer your question, we need the make and model of tthe pistol. There are some pistols that do not have a hi cap mag, and not all mags work in all pistols.
No
9mm MKV is not the same as 9mm Luger.
Most likely a 9mm with a suppressor
The 9mm Parabellum is longer than the .380 ACP (also called the 9mm Short) They do not interchange.
It is 9mm pistol
Exactly how is the pistol marked? 9mm browning serial number 72C44338
9mm
it is a Model 39-2 9mm pistol
You can buy magazines that have various capacities. For some pistols, normally those shot in competition, you can get magazines that hold 20 or more. Most defensive handguns come with magazines that hold from 9 to 15. I have a magazine that holds 28 rounds of 9mm and fits a Sig 228, but it is a cheap aftermarket magazine and is extremely unreliable.