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In firearms terminology, a floating firing pin is one which is unrestricted by a firing-pin return spring or similar. While it will be captive and unable to simply fall out, either forward or backward, it is otherwise free to slide within these stops. The trapdoor Springfield Model 1865 is an example of a floating firing pin. [11]
The free-floating firing pin of AR-15 style rifles typically causes an indentation as the firing pin lightly strikes the primer when the bolt closes as it chambers a loaded cartridge. Although a single light indentation may not detonate the primer, [ 2 ] the indentation may make the primer more sensitive to subsequent impact.
From the top: striker-fired, linear hammer with free-floating firing pin, hammer-fired with free-floating firing pin, and hammer-fired with integral firing pin. The hammer is a part of a firearm that is used to strike the percussion cap/primer, or a separate firing pin, [1] to ignite the propellant and fire the projectile.
While early (1949–50) Soviet models had spring-loaded firing pins, which held the pin away from cartridge primers until struck by the action's hammer, most variants of the SKS have a free-floating firing pin within the bolt.
[47] [48] The original design features a free-floating firing pin. To theoretically reduce the risk of slam-firing, the HK416 and its civilian variant MR556 feature a proprietary firing pin safety in the bolt. Such firing pin safeties may obstruct the upper from working with standard AR-15-type full height hammers located in the fire control ...
The three-position lever, when pointed forward in the "PR" or safe position, decocks and locks the hammer, locks the slide to the frame and prevents forward travel of the free-floating firing pin. When pointed downwards to the "OD", or single-shot position, the safety lever deactivates the auto-sear and rate reducer to allow semi-automatic fire.
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Mainsprings should not be confused with the type of firing pin spring which is utilised in some designs instead of free-floating firing pins to prevent slamfire. Parts sketch of the firing mechanism on Russian infantry rifle model 1845.