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If the decocker is n the fire position, and a round is chambered, the hammer will rise and fall, striking the firing pin. The pin will strike the primer of the cartridge, firing the pistol.
An M9 pistol is not capable of automatic fire, in any form. The firing mechanism is not designed to fire a new round until the trigger is released and pulled again. That is, what is commonly called the "action" of the pistol needs the trigger to be pulled to release the firing pin after each round is fired.
Obviously, it will depend on the caliber of pistol, and the distance between you and the pistol. A person firing a .357 Magnum revolver would be exposed to ABOUT 140 dB.
The safety on a pistol is a device to prevent it from firing accidentally.
Properly, a semi-auto or self loading pistol. It is a handgun, that when fired, extracts and ejects the fired cartridge, loads a fresh cartridge and recocks itself for firing, no action taken by the shooter.
A pistol by loading ammunition into the chamber. The firing the pin then strikes the cartridge, which causes the pistol to discharge.
firing with a limp wrist to see if pistol will malfunction
Impossible to answer without a detailed description of ALL markings. Hereter's had various makers make the weapons they "branded" with their name.
NoSlide and Barrel Assembly: Houses the firing pin, striker, and extractor. Cocks the hammer during recoil cycle.Receiver: Serves as a support for all the major components. Houses action of the pistol through four major components. Controls functioning of the pistol.