9mm misfire

[masterchither]

I recently purchased the M&P 9mm and I already own the M&P 40 full size, and also a H & K 45 full size. My question is on misfire, where the firing pin does dent the round but the round does not fire.

I have never had a misfire ever, and only with this new 9mm has it happened. Question would it be more than likely the ammo it's self or something wrong with the pistol?

I have put about 400 rounds through it so far, and during the first 100 which btw was ammo I have never shot, I had the three misfires. I can't remember the ammo brand, just some inexpensive ammo I got from Joes sporting goods. The other three hundred rounds was Winchester 100 round count which I know is more dirtier but no misfires.

I can't wait to fully break in the new 9mm and do it first cleaning... I want to put another 200 round through it then clean it.

Semper Fi

 

[David Sinko]

If you are using questionable or unknown ammo, my guess is that it is indeed the ammo. If you don't have any more of this stuff left, you should keep shooting more factory loaded ammo. If you don't have another misfire, the gun is OK.

Dave Sinko

 

[handgunner356]

I would compare the firing pin dent with the other cases, even with your 40 fired cases. You could have dirt/grit in the striker pin channel or a out-of-spec striker. If all the primer hits look the same and it's happened on several different brands then I'd probably call S&W and see about getting a pickup tag to send it in. I did have a couple of early production 40s' that had a different design striker without a "pad" where they engage the sear and had light strikes with them, S&W sent me a new striker and that took care of the problem.

 

[Steve C]

Field strip and do a thorough cleaning. Make sure to clean and lube the firing pin channel. New pistols are treated with a rust inhibitor for shipping which isn't a good lubricant and can slow down the striker speed and how hard it hits the primer. Also any debris that gets in the striker assembly can slow down the mechanism.

After cleaning take it back to the range to see if the problem reappears. If so sending it to the company to check for a mechanical problem is the best option. Make sure to enclose a description describing the problem and a pic of the primer of the misfire's primer can help them figure out the problem.

 

[ArchAngelCD]

I can't wait to fully break in the new 9mm and do it first cleaning... I want to put another 200 round through it then clean it.

Semper Fi

You should have given your pistol a through cleaning before you fired it for the first time. Also, why are you waiting to clean it since you already fired it at the range? IMO you should clean your handguns each and every time you bring them to the range and shoot them. Why would you want to put a handgun away dirty? My goodness, I can't imagine shooting any of my guns, not cleaning them and storing them dirty!

I'm a revolver guy so bear with me, what do you mean by "fully break in" your handgun?

 

[masterchither]

If you are using questionable or unknown ammo, my guess is that it is indeed the ammo. If you don't have any more of this stuff left, you should keep shooting more factory loaded ammo. If you don't have another misfire, the gun is OK.

Dave Sinko

Thank you Dave, I will try to use just to brands of ammo, range ammo and personal carry.

 

[masterchither]

I would compare the firing pin dent with the other cases, even with your 40 fired cases. You could have dirt/grit in the striker pin channel or a out-of-spec striker. If all the primer hits look the same and it's happened on several different brands then I'd probably call S&W and see about getting a pickup tag to send it in. I did have a couple of early production 40s' that had a different design striker without a "pad" where they engage the sear and had light strikes with them, S&W sent me a new striker and that took care of the problem.

Okay, I will make sure the range is clean in my firing area and collect the first twenty shell casing and keep them in my range bag. If I ever get another misfire I will be able to compare where it hits the primer.

I am not sure what a sear is but I will find out later..

Thank you

 

[masterchither]

Field strip and do a thorough cleaning. Make sure to clean and lube the firing pin channel. New pistols are treated with a rust inhibitor for shipping which isn't a good lubricant and can slow down the striker speed and how hard it hits the primer. Also any debris that gets in the striker assembly can slow down the mechanism.

After cleaning take it back to the range to see if the problem reappears. If so sending it to the company to check for a mechanical problem is the best option. Make sure to enclose a description describing the problem and a pic of the primer of the misfire's primer can help them figure out the problem.

I will be cleaning it from top to bottom..

TY

 

[masterchither]

You should have given your pistol a through cleaning before you fired it for the first time. Also, why are you waiting to clean it since you already fired it at the range? IMO you should clean your handguns each and every time you bring them to the range and shoot them. Why would you want to put a handgun away dirty? My goodness, I can't imagine shooting any of my guns, not cleaning them and storing them dirty!

I'm a revolver guy so bear with me, what do you mean by "fully break in" your handgun?

I didn't clean it the first time shooting because I had just purchased it. The second time I was just doing another 200 - 300 rounds through for what some people refer to as a dirty breakin..

I will be cleaning the pistol before my next shoot.

Ty

 

[ArchAngelCD]

That's my point, you should have thoroughly cleaned and lubricated the pistol because it was new from the factory. As for leaving it dirty after shooting 200 rounds the first trip, that's your choice, I just can't leave any of my guns dirty and put them away. It was more important to clean and lube the pistol before the first range trip IMO.