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slide assembly...pretty sure
Firing Pin Block
The extractor protrudes... this much is true. However, I've never known it to be red on the M9 unless this is a recent feature added to the M9.
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.
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.
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.
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.
A Chambered round.
The M9 pistol uses an "oscillating Block" locking system. At the moment of firing, the slide and barrel are locked together. They are both driven rearward by recoil- but after about 3mm of travel, the barrel tips down, unlocking from the slide, which continues to the rear. For additional information, do a web search for 3-23.25, the manual on the M9 pistol.
Provided that the magazine is inserted in the weapon during firing, the slide remains locked to the rear.
1. safety ON. 2. Failed to chamber a cartridge when loading (magazine not fully seated)
The M9 is a standard 9mm round. the M9 is actually a .355 caliber