M&P 2.0c 9mm question

[Tawadc95]

I have 3 M&P 2.0c’s and 2 Shields, all 9mm. 
4 guns exhibit a slight bit of muzzle jump to the left when dry firing, the 5th, a 2.0 does so more than all the others.

With 4 their is no real noticeable influence on poi.

With the one 2.0 it’s a noticeable left poi by the time I’m at 12 yds if poa is the bridge of the nose the poi is the eye socket.  
I’m left handed so I can’t use my thumbs to offset this in fact it exacerbates it. I don’t want to change my thumb pressure for one gun, I’d rather grip remain constant. 
Is this something anyone else experiences with these models?

What about adjusting the red dot on the offending weapon to compensate, it is a very consistent left poi?

Thoughts and suggestions please, thanks!

Edited July 4, 2021 by Tawadc95

[mpom]

Are the fire control components OEM or Apex? Wondering how much overtravel your triggers have and if that is the cause of the muzzle movement with the break.

If OEM trigger parts, you can try to make a temporary overtravel reducer to see if this is a factor. Can use double sided tape to hold a small piece of plastic to frame behind trigger, or if lots of overtravel, maybe  tie a small zip tie around trigger...

All my M&Ps have either Apex parts or JB Weld overtravel "bumps" and I only see the muzzle jump in dry fire if I loosen my grip.

Mark

[Tawadc95]

Apex duty/carry triggers in all of them.

 

[SteelCityShooter]

On 7/3/2021 at 11:50 PM, Tawadc95 said:

IWhat about adjusting the red dot on the offending weapon to compensate, it is a very consistent left poi?

That seems to be the logical approach.

[Tawadc95]

I’ll give that a try, it does seem the easiest solution. The gun dies shoot real nice groups. 
I sighted it in on a rest but it does seem that standing is real life. 
Thanks for responding. 

Edited July 6, 2021 by Tawadc95

[Lior]

Hi. This topic was discussed here not too long ago. Basically you've got nothing to worry about.

 

[Tawadc95]

That’s interesting

[Drillbit]

On 7/4/2021 at 7:51 AM, mpom said:

 

All my M&Ps have either Apex parts or JB Weld overtravel "bumps" and I only see the muzzle jump in dry fire if I loosen my grip.

Mark

I did the JB Weld over travel bumps.  I thought I was being clever.... I guess not that clever.

[Tawadc95]

I’m not sure what over travel bumps would do for you with regards to poi, if your trigger press is going to mess with your poi after the sear release it would certainly be upsetting poi before sear release. 
It’s not a grip issue as this is the only one of 5 S&W M&P guns, three of which are identical  2.0’s to move like this, as well, poor grip issues produce pretty erratic grouping in quicker splits which is not the case with this gun, it produces very nice groups with 1/4 sec splits. 
I’ll move the dot this weekend to accommodate it but I really wish I understood the root cause of this issue, what is mechanically happening inside the gun that creates this. 
 

[mpom]

The thread Lior linked to discusses the internal mechanics of striker fired pistols leading to what you are describing, which is happening in all your M&Ps, to varying degrees.

Have you tried dry firing with a mag loaded with dummy rounds, to create upwards pressure on the slide?

That would reduce/eliminate slide movement upwards when striker is released and recoil spring becomes unopposed by striker spring.

As far as overtravel , are you saying significant overtravel would not affect poi, compared w same pistol and minimal overtravel? Not arguing, just trying to learn.

 

Mark

[Tawadc95]

Yes, I dry fire with dummy rounds chambered but not in the mag as part of my safety protocol for dry fire practice. Dummy rounds and live rounds with a full mag do not eliminate the exaggerated, in comparison to the other guns, jump. 
What my curiosity  was in regards to overtravel is that if you are moving the gun in the trigger press due to overtravel you are moving it before the sear release, a bad trigger finger is bad the whole pull, at least that’s the way I assess it. 
I just found out how to access the thread which lior referenced, headed there now. 

Edited July 9, 2021 by Tawadc95

[Tawadc95]

Interesting thread. 
I guess my main concern was moving the sight to accommodate a possible problem I was inducing but I doubted it was me due to the tight groupings of

offending gun and no such problem with the other 4 M&Ps. Btw I moved the slide for curiosities sake onto another frame and had the same results. 
I don’t like to adjust sights for my poor shooting, I’d rather cure my problem if this makes sense. 
After reading the Oct thread I’m satisfied that adjusting the dot won’t be a compromise decision, it’s just the way that particular gun is.

Edited July 9, 2021 by Tawadc95

[Tawadc95]

Update on this.

I finally was able to get around to adjusting the dot in this gun. 
When I first installed the optic I sighted it in using a bench rest to be hyper accurate. All my shooting is standing and other positions not involving a rest. 
I decided to adjust the sight the way I shoot , standing and moved poi 2” right and up 1” at 25 yds. 
Once satisfied with the results I decided to see what it did from the rest and it was as I suspected 2” right of center. 
The gun shoots spot on now, it was not the problem of the gun twitching left when the sear disengages, turns out I was holding the gun with a slight cant and my head in a different position from the rest as compared to standing. 
Moral of the event, sight the way you will use the gun. 

[mpom]

Resurrecting an older thread as I noticed the dot jumping to the left just a bit while dry firing, even when pushing the slide closed prior to actual trigger press. This seems to have gone away when I switched to the Medium/Large backstrap from the Medium backstrap the 2.0 Compact typically wears. Will try it live fire and see if POI changes and more importantly if my accuracy and times improve w the larger backstrap.

 

Mark P