MP22 Slide not staying open

odsixer

odsixer

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After the last round has been fired, once in a while the slide does not stay open.

Most of the time it works fine and holds open, ready for the next mag.

Anyone know the cause?, other than this it's performed flawlessly with around 400 rounds through it.

Thanks
 
First thought is you are interfering with the slide release/stop when firing. This is the easiest way to explain it happening intermittently.

Underpowered ammo? What are you using? High velocity stuff works flawlessly in mine, but I have had the slide not cycle once with a noticeably weak round.

Dirty? Have you cleaned it recently? Dirt could cause enough friction combined with weaker ammo to not allow the slide to go back far enough.

Limp wristing? It's a .22, but it will take all of the rearward force that the little 22 cartridge can muster to make the slide recoil fully. If your wrist is absorbing any of that recoil force it could be causing the issue.

These are the more likely culprits, but if it is only happening randomly I would think it is either your grip intefering with the slide stop, or a limpwrist issue.

If not, examine the slide notch where the slide stop engages. There should be no wear and there is actually a steel pin there for the engagment surface as the aluminum is not hard enough.
 
The slide stop is engaged after firing the round by the slide stop. If you are using different magazines, check to see if it is just one mag that is giving you the problems.

So to recap;
Check grip (contacting slide stop and limp-wrist)
Check cleanliness and lubrication of the pistol
Check ammo for proper functioning
Check mags
Check slide stop and slide for damage or unusual wear.

That should about cover it. Good Luck

tbhupe
 
Thanks guys, probably a case of riding the slide stop, I honestly didn't even think of it. oops!
I will check my form next time I shoot.
 
A few years back, I bought a .22 conversion kit for my 1911 in order to shoot .22 rimfire steel target matches. As the targets were steel "gophers", I needed a fair amount of juice to knock them down. I went out and bought 15 different types of .22 ammo and chroned them all. Result, the velocity printed on the box in most cases is nothing like what comes out of the barrel in a lot of cases. Keep trying different ammo until you find one that functions flawlessly with the pistol.
 
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