There are different types of slamfire, the most scary one is while loading and cocking the weapon, this could be due to a faulty trigger group which allows the hammer to be released along with the bolt carrier folowing right behind as though the trigger was pulled, or because of a free floating firing pin which carries forward with inertia , with heavy milspec firing pins and lame civilian ammunition the primers could be detonated just by this inertia.
Another type of slamfire known as doubling can be caused in the same way, this is when two rounds are fired instead of one. Sometimes this can be even worse and your whole magazine can be unloaded. Several civilian shooters have been killed when a fully automatic weapon has been loaded with commercial ammunition and has unintentionlly fired when loading. Inertia problems can be fixed by using real military ammunition instead of civilian or by switching to a lighter firing pin.
Faulty trigger groups are a serious but rare problem and should be fixed by an armourer ASAP. Groups of five primed cases each had different primers seated in them. Bolt was locked back without a magazine in the carbine and the primed case was dropped into the chamber. With the muzzle pointed about 20 deg below horizontal and the carbine held only by the pistol grip, the bolt was released by pulling fully back on the charging handle and releasing to get maximum bolt velocity without magazine drag in feeding.
The average of the diameter of the firing pin indent was measured for each primer using a 10X measuring microscope with a reticle. Within each group the indents were effectively identical. The case with the largest indent in each group was then subjected to 4 additional bolt drops as described above and the indent then measured. While I don't have the time to do a similar test with large primers I am very sure the results would be similar.
However, the M1 Garand, M1 carbine, and M14 are all designed to cam the firing pin back and prevent it from moving forward unless the bolt is fully closed. With these arms slam fires require a very high primer to occur. If you use commercial cases, primer seating is not a big deal. If you use GI cases you need to swage the crimp out of the primer pocket AND ensure that there is no trace of the crimp jammed down into the primer pocket.
In setting up for this test I played with some crimped once-fired GI cases that were swaged with a Dillon primer pocket swager. While the crimps were nicely swaged out, in many instances there was a sliver of the crimp stuck in the primer pocket that would interfere with primer seating resulting in high primers. To check out a worst case scenario, I swaged some primer pockets of a bunch of once fired LC08 cases, until I got 10 cases with the sliver in the bottom.
I hand primed these with the Win SR primer with a Lee hand tool until the primers FELT seated and wound up with 5 cases each, with the primers approximately. I then dropped the bolt on each of them as described above. None of the. With the. The indents on the cases that fired were about. The remaining three survived 5 drops without going off but had large dimples in them. No matter what primers you use inspect ALL your primed cases to ensured the primers are seated below the base of the case.
I have found that using the "steel" pin media used wet cleans the pockets out very well and smoothes the edges a little. An incorrect shell hold can prevent the primer from fully seating. A correspondent noted a slam fire because of incorrect assembly.
It seems like the legs of the firing pin retainer cotter pin spread when it was inserted so both legs didn't go through the hole on the opposite side of the carrier. One leg bent down and kept the firing pin forward which caused a slam fire when the bolt was dropped on a live round. Something to pay attention to.
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|Slam fire||Firearms designed to discharge as the bolt closes may have a fixed firing pin or a firing pin which moves forward by inertia as forward motion of the bolt ceases when the cartridge is fully chambered, while more conventional firearms are designed to prevent the firing pin from impacting the primer until the trigger is pulled. Spring-loaded firing pins may move further forward than expected during the loading process if the restraining spring is broken or weakened by age. Some firearms are designed to slamfire, but the term also describes a malfunction of self-loading firearms. Homemade Machine. For 5.|
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|Slam fire||Support Telephone. Unintended slamfires are dangerous, and recoil may cause shooters to lose control of light firearms with conditions causing sequential slamfires if a normally semi-automatic firearm "goes full-auto " unexpectedly. One is to use ammunition with harder primers, which require a more significant strike from the firing pin and are thus unlikely to go off with a comparatively light inertial strike. Sometimes this inertial force is sufficient to set off the primer, thereby firing the round without the operator pulling the trigger. Faulty trigger groups are a serious but rare problem and should be fixed by an armourer ASAP. For those who aren't Gunsiters here are The 4 Rules.|
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A slamfire is a discharge of a firearm occurring as a cartridge is being loaded into the chamber. Some firearms are designed to slamfire, but the term also describes a malfunction of self-loading firearms. A slamfire is a premature, (usually) unintended discharge of a firearm that occurs as a round is being loaded into the chamber. Slamfires are most common in. It describes the situation wherein the firing pin continues to protrude after the shot is fired, so that when the next round is pumped into the chamber.