Glock slam-mag question

[DontShootMe]

When I 'slam' a full mag into my G17 with the slide back, the gun automatically releases the slide and loads a round.

Is this supposed to happen? If so, I like it.

Also, I've heard some talk of something called 'slam fire' - what is this exactly?

 

[CZ-75]

Yes, it happens on Glocks. Make sure that the slide stop is fully engaged.

Slam fire, to the best of my knowledge, usually occurs when the firing pin spring is weak and the inertia of the slide coming back to battery is sufficient to cause the FP to hit the primer with enough force to detonate it. Additionally, dirt can cause the firing pin to stick forward so that the gun fires when the slide comes back to battery.

Both could make the gun go full auto.

 

[QuarterBoreGunner]

I've seen the 'mag slam slide release' on Glocks and on HK USP. Usually on well worn guns with weaker slide stop springs.

As Microsoft would say: "It's an undocumented feature"

It's a little disconcerting when it happens though.

 

[Navy joe]

Ok, first off a traditional slamfire isn't going to happen with a Glock. If you think it did, guess what? You pulled the trigger. Maybe there could be a slamfire from a high primer, I'll let you know as soon as I see a high primer.

The mag releasing? I count on it. Both of my guns are in good condition with new slide stops. The slide releases with 10 rd mags and FML hicaps. No dice with NFML hicaps. It's quicker for me than using the slide release, if it doesn't drop I overhand rack the slide.

 

[C. H. Luke]

A lot of the guys I shoot IDPA with modify their Glocks to do just that! {if their guns don't do it already}

 

[prisoner6]

Ok, first off a traditional slamfire isn't going to happen with a Glock.

Can someone please clarify this? I realize itshouldn'thappen with any weapon in good condition, but is there a design feature that would single the Glocks out and make them less vulnerable? A weak firing pin spring could occur theoretically with any make I would think. As could foreign particles in pushing the pin up. It's not that I'm doubting, this may very well be the case, I just was curious as to the explanation.

 

[Andrew Wyatt]

I've done it a time or two with my 1911, usually with wilson magazines, and usually when I slam it really hard.

 

[Navy joe]

First off the Glock striker is blocked and the block is disengaged only by pulling the trigger. Second, as the slide returns forward the striker engages the trigger bar stopping any forward motion of the striker and actually pulling it most of the way rearward in preparation for the next shot. The striker will only disengage from the trigger bar when you pull the trigger to the rear which completes pulling the striker to the rear and then the trigger bar is driven down by the connector. Gun goes bang.

The "firing pin spring" in a Glock is actually the striker spring that generates the force necessary to ignite the primer. Were it to be weak you would get failure to fires from light strikes, not slam fires. There is no floating firing pin as there is in M-16s, older 1911s, BHPs and others.

 

[krept]

CH Luke, any idea of how they do the mods?

 

[DontShootMe]

Thanks!

I like the analogy of "microsoft undocumented feature"

I appreciate the info from all. Thx again!

 

[memorex]

happens to me

glock 34 with a few thousand rounds, maybe. Not every time, but in competition, I slam the mag home and give it another slam most of the time and it'll close.

Asked about it on GlockTalk.com and they said it was common.

 

[C. H. Luke]

Krept,

You just lightly file the top rear of the lever where its already wearing from contact with the slide at a slight angle. It's a file & try then file again process untill you get it where you want it.

C.H.

 

[arinvolvo]

My steyr will also release the slide when I slap a mag home nice and hard...It wont do it if I just insert a mag normally....But If I want to be fast, just slam one home.