Slide Failure to lock back.

[NU9MM]

Ok I finally got out and shot m new M&P 2.0 optic ready 9mm over the weekend. As well as my original 2.0 9mm. As the title says the slide did not lock back on it twice. And on the other 2.0 I had one failure to feed. Any ideas what may have caused either of the issues on these two particular pistols. A FFL friend said it's known to happen on the M&P's as far as the failure to lock back. I believe he said the M&P's are weak in that area. So he oiled the slide where it makes contact with the rails. He said that should help. And all suggestions are greatly appreciated but I absolutely love the way that optic ready 2.0 shot very nice. Love the way the original 2.0 shot.

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[TTSX]

Try some 124 grain instead of 115. Has juuust a little more pop to it.

I have an m&p with the opposite problem. Slide will sometimes lock back on a loaded mag

 

[Koda]

Be sure your thumb isnt near the slide lock lever.

 

[solv3nt]

Try a different magazine.

 

[TTSX]

Try a grilled cheese sandwich

 

[NU9MM]

Try some 124 grain instead of 115. Has juuust a little more pop to it.

I have an m&p with the opposite problem. Slide will sometimes lock back on a loaded mag

Ok yes I'm use 115g. All of my defensive ammo is 124g and some +P.

 

[when_DM_smiles]

Be sure your thumb isnt near the slide lock lever.

Can also try shooting weak hand on the last round. That sometimes identifies riding the slide release.

 

[NU9MM]

Be sure your thumb isnt near the slide lock lever.

 

[NU9MM]

Be sure your thumb isnt near the slide lock lever.

I know that slide lock sticks out much more that the original 2.0!

 

[solv3nt]

Try a grilled cheese sandwich

I'm surprised you didn't say "try a block".

 

[Xmark1]

Think File.

 

[lucusloc]

Try a different magazine.

I believe the issue with the M&P is not the mag, it is that the slide just barely does not recoil far enough back for the catch to engage. You need to find enough energy for it to slide back that extra fraction of a millimeter for the catch to engage. Once it does any decent mag should engage it and your issue is solved.

 

[Koda]

I believe the issue with the M&P is not the mag, it is that the slide just barely does not recoil far enough back for the catch to engage. You need to find enough energy for it to slide back that extra fraction of a millimeter for the catch to engage. Once it does any decent mag should engage it and your issue is solved.

If thats the case then its a warranty issue.

Also, when troubleshooting guns its important to use only the factory mags that came with the guns. If it doesnt work with those then send it back.

 

[Stomper]

I'm surprised you didn't say "try a block".

Oops…. You misspelled,
"Glock" again!



Maths is hard!

 

[TTSX]

Oops…. You misspelled,
"Glock" again!



Maths is hard!

I heard he's been drinking the lead acetate from "the dip" suppressor cleaner because it's sweet. Or at least, that's what I tell everybody.

 

[solv3nt]

I heard he's been drinking the lead acetate from "the dip" suppressor cleaner because it's sweet. Or at least, that's what I tell everybody.

It's tough to beat sweat tea acetate.

 

[Xmark1]

I believe the issue with the M&P is not the mag, it is that the slide just barely does not recoil far enough back for the catch to engage. You need to find enough energy for it to slide back that extra fraction of a millimeter for the catch to engage. Once it does any decent mag should engage it and your issue is solved.

Install a less power recoil spring.

 

[lucusloc]

It's tough to beat sweat tea acetate.

This forum has so many inside references I have a hard time keeping track of which thread I am reading.

 

[64MercurysRule]

This forum has so many inside references I have a hard time keeping track of which thread I am reading.

Uncle Si sweet sweet southern tea .

 

[L84Cabo]

Be sure your thumb isnt near the slide lock lever.

^^^ THIS. Shooting 1911's and my giant jungle monkey thumbs do have a habit of migrating toward the slide lock lever.

Next time you go to the range to shoot a couple hundred rounds, do so with a thumb over thumb grip or in some other manner where you're 100% certain your thumbs aren't contacting the slide lever.

As for trying to figure out a single failure to feed, that's pretty difficult with only one failure to go off of. But if your thumbs are contacting the slide lever and/or the slide itself, it may be enough to slow the slide down enough to induce a failure.

But isolating your thumbs is a logical and easy first step to help determine if you've got a real mechanical issue or a shooter induced issue. Hope that it's shooters induced because that is usually a much easier and cheaper problem to solve.