What Do You Look For In The Best AR-15 Firing Pins? The video below illustrates this whole process. Unlike other guns, the AR-15 uses a gas system that uses gas blocks to divert some of the gas back to the bolt carrier group to automatically cycle the next round. Since the ammo’s cartridge blocks the gas from exiting to the rear of the gun, it has nowhere to go but forwards, pushing the bullet out ahead of it. That creates a high-pressure environment behind the bullet. The primer strike causes the primer to ignite, which in turn produces hot, expanding gas. The firing pin then moves forward itself so that the tip of the pin hits the primer of whatever round is in the chamber. When the shooter pulls the trigger, it causes a piece called a sear to release the hammer so it moves up and forward, hitting the firing pin. To understand how firing pins work is basically to understand how firearms work. You don’t need to worry about the technical details too much, just know that you don’t need to get a firing pin spring for your build and, if you’re upgrading, you’re not missing a piece when you open up your upper receiver and don’t see a pin. This means that there’s no firing pin spring.
We’ll talk a bit more about exactly how that works below.Īn AR-15 uses what’s called a free-floating firing pin. It’s responsible for hitting the primer at the rear of the ammo cartridge, which starts the chemical reaction that causes the bullet to actually leave the gun. Obsidian Arms Enhanced AR-15 Bolt Carrier Pin KitĪ firing pin is an important part of the bolt carrier group (BCG) of your AR-15 (and on most other guns, for that matter, including both rifles and handguns, such as the 1911).Iron City Rifle Works Titanium Firing Pin (Best High End).Obsidian Arms Enhanced AR-15 Bolt Carrier Pin Kit Iron City Rifle Works Titanium Firing Pin (Best High End) What Do You Look For In The Best AR-15 Firing Pins?.
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