Slide closing when changing mags

[dleong]

Quote:What you're probably experiencing is the slide stop contacting a bullet in the mag causing the slide lock to move upwards and unlock the slide.

That is incorrect.

The slide stop has to move down to release/unlock the slide.

What you are describing is a situation in which the projectile contacts the peg on the slide stop and pushes it upward, causing the slide to prematurely lock back in mid-magazine.


DL

[Uncle Alvah]

Thats a good pic for reference. I'll have a look at the stop in my gun for comparison, but don't EXPECT to find much wear. This gun likely has less than 500 rounds thru it.

[Walt-Sherrill]

You're right. I got it backwards.  

(In other words, its not likely to be caused by out-of-spec ammo or weak mag springs.  Seems as though I said what you just said, in response to another answer.  Every once in a while I engage the keyboard before I engage the brain.)

He should examine his slide stop and compare it to the photos, above.  That's a good culprit.

And it could also be a slide stop spring that's gotten weak, or has moved out of position.

[Uncle Alvah]

Quote:And it could also be a slide stop spring that's gotten weak

Walk me thur that, please, I'm confused(happens a LOT!).
In which direction is the spring pushing? The gun is not at hand and neither do I have an exploded view available.
If the spring is pushing UP, I don't see how the jolt would affect it. If it is pushing OUT, I still have trouble understanding how an upward jolt would affect it.
Pest, ain't I?

[dleong]

Quote:And it could also be a slide stop spring that's gotten weak, or has moved out of position.

Since the slide stop spring (#3) is exerting downward pressure on the slide stop, it is highly unlikely a weak spring could be contributing to the problem at hand.

(A weak slide stop spring could possibly cause other problems, like the slide stop slipping out of its hole and/or "bouncing" up on recoil and inadvertently locking the slide back in mid-magazine.)


DL

[Walt-Sherrill]

If the spring is weak, the slide stop moves more easily -- upwards or downwards.  Jarring the gun can cause the slide stop to move.  

(This was once a common problem, a few years ago, with new CZs.  The slide wouldn't lock back, and Mike would send a new spring, or suggest the owners bend the end of the spring a bit.)

[dleong]

Quote:If the spring is weak, the slide stop moves more easily -- upwards or downwards. Jarring the gun can cause the slide stop to move.

That is correct. However, an "in spec" slide stop spring exerts downward pressure on the slide stop, meaning that a weak spring exerts less downward pressure, and is therefore less of a contributing force to the slide moving/jerking downward and releasing the slide when a loaded magazine is slammed in.

Quote:(This was once a common problem, a few years ago, with new CZs. The slide wouldn't lock back, and Mike would send a new spring, or suggest the owners bend the end of the spring a bit.)

Are you sure about this? I seem to recall that the problem was with the slide locking back prematurely due to a weak slide stop spring causing the slide stop to bounce up and lock the slide back in mid-magazine. The initial concensus, if I recall, was that the shooter's hold was resulting in the thumb inadvertently contacting the slide stop and activating it.

But then again, at my age, memory is a fading resource that cannot be relied upon.  


DL

[Walt-Sherrill]

Remove the spring and see what happens.  Lock the slide [open] then slam the bottom of the grip.  Especially if you don't have a really heavy recoil spring.

(I originally wrote SHUT, not OPEN... dumb.)

[dleong]

Quote:Remove the spring and see what happens. Lock the slide shut then slam the bottom of the grip. Especially if you don't have a really heavy recoil spring.

I'll try that the next time I detail-strip one of my CZs for cleaning. The last time I drifted the spring's retaining pin out, the spring launched itself into parts unknown in my room.

However, I think I can predict the results: without the spring in place providing downward pressure on the slide stop, it is going to be more difficult to jar the slide into releasing by slapping the bottom of the magwell.


DL

[fritze01]

The only way a slide sould move forward is with the manual release of the slide stop or

the retraction and release of the slide in a gun with a magazine possesing at least one round in it so that the follower does not engage the slide stop into the slide.

Anything else is a malfunction.

[Justice4all]

Yep, I was way off on what the cause was.  Not even sure how I made that work in my mind.

Thanks for clearing that up dlong.

Still, not something it should do.