10mm M&P PC with Apex Trigger Reset Failure

[jasonfreeland]

Just had my 10mm at the range with a newly installed Apex trigger (professionally installed) and about 70% of the time the trigger wouldn't reset and you had to pull the slide partially back to get it to do it. I tried both the factory 17# recoil spring and a Galloway 22# and four different types of ammo (AAC, PPU, S&B and Hornady). They all did the same thing with most of the time the trigger not resetting. I know very little about striker fired pistol triggers work, so I had the gunsmith at my range do the install. They aren't open on Sundays or I would have had them look at it, I'll have to wait until Tuesday before they are open again. Any thought as to what this might be?

The pistol in question




What I did with it today, with my arthritic hands at 7 yards. I practice at that distance with pistols, because it's the most likely distance I will have to use it at. I'm sure a lot of you could do better groups, but this is good for me.

 

[dajogejr]

I had the same issue with an Apex kit in my 2.0 Comp Carry.
No matter what I did, it was slow/inconsistent reset. I ended up putting the factory return spring in, fixed the issue.
I’ve used several Apex kits in the past, this one…was a disappointment.
None of the trigger spring weights were as advertised with the kit, no matter what combo I tried.

Jason, FYI. Recoil spring and ammo have nothing to do with trigger reset function.
if the slide if fully cycling, as in…it fires, ejects empty casing properly, strips a new round off the magazine, loads/chambers a round properly..

If THAT aspect isn’t happening, then it could be recoil spring (doubtful) or ammo related (more likely).

But if was feeding properly, ejecting properly, cycling properly, rule the ammo and spring out.

Apex uses its own sear cam. It is entirely possible the kit was installed wrong, but truth be told, there’s really nothing to them. They’re 15 to 20 minute installs, as long as you’re not all thumbs with small parts. Good luck.

 

[STORMINORMAN]

Google "Apex M&P trigger reset adjustment"... More than a dozen videos.

Cheers!

 

[jasonfreeland]

I had the same issue with an Apex kit in my 2.0 Comp Carry.
No matter what I did, it was slow/inconsistent reset. I ended up putting the factory return spring in, fixed the issue.
I’ve used several Apex kits in the past, this one…was a disappointment.
None of the trigger spring weights were as advertised with the kit, no matter what combo I tried.

Jason, FYI. Recoil spring and ammo have nothing to do with trigger reset function.
if the slide if fully cycling, as in…it fires, ejects empty casing properly, strips a new round off the magazine, loads/chambers a round properly..

If THAT aspect isn’t happening, then it could be recoil spring (doubtful) or ammo related (more likely).

But if was feeding properly, ejecting properly, cycling properly, rule the ammo and spring out.

Apex uses its own sear cam. It is entirely possible the kit was installed wrong, but truth be told, there’s really nothing to them. They’re 15 to 20 minute installs, as long as you’re not all thumbs with small parts. Good luck.

Yeah I know on the recoil spring and reset, I was also trying to test the heavier spring to solve another issue. The gun tends to have random failure to feeds on hotter ammo, but I didn't notice it on either spring this time. The reset issue was kind of drowning out everything else it was so common. I now have a 24# spring in addition to the stock 17# and the 22# I got earlier. Nice to have options, if I need them.

 

[jasonfreeland]

This is what the gunsmith said he thinks is happening. The striker is wobbling and is canted 5-10 degrees off vertical and is intermittently hitting the firing pin stop. Is that something that is normal to 10mm MP 2.0s as far as the striker goes? He hasn't worked on a 10mm S&W before. We compared it to a 9mm that was brand new and the striker didn't move much off vertical and wasn't canted.

 

[jasonfreeland]

Another gunsmith has diagnosed the problem as "Sear Flutter". He has an M&P that does the exact same thing and has not found a definitive solution, although he has found several "fixes" on the net.

 

[dajogejr]

Put the factory sear and sear spring back in…see if that resolves it.

 

[jasonfreeland]

Put the factory sear and sear spring back in…see if that resolves it.

Did that already, no joy. Wish it would have worked.

 

[M1A4ME]

I had similar issues with a 1.0 9MM (all factory) within a few days of buying it (this was many years back).

I had both issues - sear flutter and a timing issue (striker sometimes hitting the striker block as it moved forward.) The 1.0 has a different set up in the sear housing than the 2.0 but you may still have a similar issue on the sear flutter.

If you have a "dead" trigger the sear isn't catching the striker as the slide moves forward. when you pull there trigger there is nothing to be felt except the trigger moving to the rear.

If you have a timing issue the striker moves forward but bumps/drags against the striker block and is slowed down enough that it can't ignite the primer. You feel that striker movement/release and the strike impact on the striker block and primer and can sometimes hear it as well. You just don't get a bang from the chambered round. If you pull the slide back and eject the round in the chamber you can see a small dent in the primer

I found a small piece of "stuff" in the sear spring hole. No idea what it was. Looked like a small, almost round piece of black plastic. Got that out and put it back together and no more sear flutter issue. In your case reinstalling the factory spring might help. I don't know if anyone makes a stronger M&P sear spring or not.

If the sear isn't catching the striker and you believe it's because the striker is "cocked" in the striker channel a new striker assembly doesn't cost much and several vendors on line sell them. Easy to install, too. You can remove the cover on the rear of the slide (take the slide off the frame), push down on the striker block (while the slide is lying upside down) and the striker assembly will slide backwards out of the slide. Reverse those steps to install the new striker assembly.

 

[hardluk1]

We have 4 m&p's both early models and 2.0 , in 9mm and 40sw versions but no 10mm interest . Installed them my self and never had a single issue over the years . All our have thumb safetys, one added and trigger pull weights adjusted into the mid 3lb reange . All were will tested befor any upgrades . Oldest m&p is a early m&p CORE 9mm with close to 22,000 rounds fired with a apex fst kit in it but is now my wifes house gun .

Could be a striker problems since it still not reliable with stock parts ?