If you're referring to the US M9 pistol - the Beretta 92F - you can decock it simply by placing it on safe. The Beretta 92/M9 has a slide mounted hammer drop pin block safety which releases the hammer and blocks the firing pin so that the hammer won't strike it.
If you want to actually CLEAR the pistol, you would put it on safe, drop the magazine, pull back the slide, inspect the chamber, then release the slide.
I'd walk you through the functions check, but it's been too long..
Always point it in a safe direction before decocking. My 9mm has a decocking lever on the side, above the magazine release. Down decocks, up is the safety. You can also decock it by placing your thumb on the hammer, gently squeezing the trigger until the hammer is released, and slowly letting the hammer down. If your thumb slips off the hammer the pistol may fire, which is why you want it pointed in a "safe" direction.
Yes
There are 3 safety features incorporated with the design of the M9 pistol. They include a firing pin block, a decocking mechanism, and a hammer half-cock.
Decocking, safety lever, and firing pin block. The link at the bottom of this page will take you to the study guide for the M9 pistol. 2010 US Navy answer: Decocking/Safety lever, firing pin block, and half-cock notch.
A note is an operating procedure, practice, or condition that is essential to __________.
A note is an operating procedure practice or condition that is essential to EMPHASIZE. This is the answer for the M9 service pistol operator training for NKO.
Condition 2, does not apply to the M9 Service Pistol.
The M9 is a standard 9mm round. the M9 is actually a .355 caliber
9mm
One would not need to purchase an M9 pistol. One may want to purchase an M9 pistol so they can go target shooting with it. Target shooting is a hobby many enjoy.
125mm
Ejector
217 mm