The 9mm pistol would have the higher decibel rating.
NEVER SHOOT AMMUNITION IN A WEAPON NOT CHAMBERED FOR IT!!!!! Do not attempt this.
probably If the pistol is designed for 9mm Luger, 9mm Para, or 9x19, yes.
It depends on a couple of factors, but in general, a 9mm is louder because it's a higher pressure cartridge than the .380.
No
Most likely a 9mm with a suppressor
9mm MKV is not the same as 9mm Luger.
The 9mm Parabellum is longer than the .380 ACP (also called the 9mm Short) They do not interchange.
It is 9mm pistol
Well...There are very few assault rifles chambered in 9mm calibers, and the few that do exist don't use the type of 9mm ammunition you're probably thinking of.In common usage "9mm" usually refers to 9x19mm Parabellum, a pistol cartridge developed for the German Luger P08 pistol. 9x19mm (also called 9mm Luger or 9mm Para) later went on to become the most common automatic pistol cartridge in the world. People referring to this cartridge simply as "9mm" is vague because there are in fact several other 9mm cartridge types out there, such as 9x18mm Makarov and 9x17mm Browning.Anyway, the only 9mm assault rifle that comes to mind is the Russian AS Val, which is a suppressed assault rifle chambered in 9x39mm (not a pistol cartridge, because it's significantly longer), and that has a rate of fire of 900 RPM. There are a huge number of pistols chambered in 9x19mm Parabellum, however, and some of these are fully-automatic machine pistols. One example of such a weapon is the Glock 18, and that weapon has a rate of fire of 1100-1200 RPM, so there's your answer: a 9mm pistol shoots faster.
9mm
Exactly how is the pistol marked? 9mm browning serial number 72C44338
it is a Model 39-2 9mm pistol