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Slamfire occurs when the cartridge discharges as soon as it reaches the chamber, rather than waiting in the chamber to receive a firing pin impact when the trigger is pulled. Schematic of an Advanced Primer Ignition blowback operation that works in a similar way to slamfire by striking the cartridge as it is moving forward before it is fully ...
The detonation velocity values presented here are typically for the highest practical density which maximizes achievable detonation velocity. [ 1 ] The velocity of detonation is an important indicator for overall energy and power of detonation, and in particular for the brisance or shattering effect of an explosive which is due to the ...
[1] [2] The term is used both for detonation of ammunition not loaded into a weapon, and unintended firing of a loaded weapon due to heating. A fast cook-off is a cook-off caused by fire. A slow cook-off is caused by a sustained thermal event less intense than fire. A cooked-off round may cause a sympathetic detonation of adjacent rounds.
Detonating cord (also called detonation cord, detacord, detcord, blasting rope, or primer cord) is a thin, flexible plastic tube usually filled with pentaerythritol tetranitrate (PETN, pentrite). With the PETN exploding at a rate of approximately 6,400 m/s (21,000 ft/s), any common length of detonation cord appears to explode instantaneously.
Primer-actuated cartridges/piston primer cartridges use a primer in the form of a blank to contain the propellant within the cartridge, or as a piston to unlock the bolt and cycle the weapon's operation. Examples are the 9×51mm SMAW, MBA Javette and the M48A2.
Out-of-battery firings can be initiated by a deliberate action by the operator (i.e. pulling the trigger) or initiated involuntarily as part of a slamfire. In handheld firearms, damage from out-of-battery discharges often destroy the firearm's magazine and destroy or severely damage the receiver, bolt, firing pin, operating springs, and stock.
To fire the gun, the user inserts a shotgun shell into the smaller diameter pipe, places the smaller pipe into the larger diameter pipe, and forcefully slides it back until the shell's primer makes contact with a fixed firing pin located inside the end-cap. [4] [5] Other improved versions use improvised detachable magazines. [21]
The primer is actually struck BEFORE the round is fully chambered and the propellant is ignited as the round moves forward. This is known as "advance primer ignition" and is a design feature of this class of weapon, which allows a lighter bolt to be used. This could be referred to as "slamfire" but is not the traditional use of the term.