Breech Face erosion? - MP-Pistol Forum

Breech Face erosion?

This is a discussion on Breech Face erosion? within the MP Pistol Tech Help forums, part of the Smith & Wesson MP Forum category; Hi new M&P owner here. This is my first handgun. After a range trip the other day i was cleaning my gun and noticed little ...


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Old April 9th, 2015, 04:26 PM   #1
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Breech Face erosion?

Hi new M&P owner here. This is my first handgun. After a range trip the other day i was cleaning my gun and noticed little waves/ripples on the breech face. Is this somthing i should be concerned about or is it normal wear and tear? I Have put about 250 rounds through my gun and bought it brand new. It is a Full size 9mm. For ammo i have used:

American eagle 115g
Hornady critical defense 115g
Winchester white box 115g
federal champion 115g

I am pretty ocd about things like this lol so i dont know if i should contact smith and wesson about it or not. i ran a pick across the surface and you can definately feel the grooves.
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Old April 9th, 2015, 08:04 PM   #2
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looks like bad machining but i never really looked at my gun like that to notice... to me if it shoots, feeds,extracts and its accurate in defense distances then im happy.
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Old April 9th, 2015, 08:59 PM   #3
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I don't think that is normal, but I don't know that it would affect the functioning or reliability of the gun. It wouldn't hurt to contact S&W and see what they say. The third photo is the best shot, so maybe you could e-mail that one to them.
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Old April 9th, 2015, 10:00 PM   #4
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How does it shoot?
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Old April 10th, 2015, 03:59 AM   #5
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Quote:
Originally Posted by KRWeiss View Post
How does it shoot?
It's hard to tell because I am new to shooting handguns so I can't tell if it's me or the gun itself that is inaccurate. I do feel like I should be hitting where I am aiming more often though.
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Old April 10th, 2015, 04:04 AM   #6
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Also it shoots and extracts fine I haven't had any problems with that
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Old April 10th, 2015, 05:57 AM   #7
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It's best to get that third picture off to the S&W shop. While the function would be OK that pattern looks like a material thing going on. If you bought it new I'd bet you have a new slide in you future.

Looking at the picture again, that could have bee caused by a broach tool that was breaking down and dulling. In either case they'd probably opt to swap a new slide in for you.

Nothing to do with the ammo you used or how you were using the firearm.

Last edited by Kyoate; April 10th, 2015 at 06:03 AM.
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Old April 10th, 2015, 07:28 AM   #8
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I would contact S&W I'm sure they will make it right for you!
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Old April 10th, 2015, 09:34 AM   #9
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To me it looks like they should have finished that a bit more smoothly, I seriously doubt it would cause any kind of functional problems at all.

IMHO this is a very minor issue of cleaning up some internal machine marks, some other companies don't even try to clean up internal machining marks. Since it is internal and strictly cosmetic I wouldn't worry about it.
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Old April 10th, 2015, 09:44 AM   #10
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Yup, send a pic or 2 to them. As far as shooting, I'm new too. I've worked at my grip and using snap caps for dry firing while concentrating on the sight picture to see if I'm moving. Pressing the trigger slowly is key.
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Old April 10th, 2015, 02:23 PM   #11
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Not erosion just a small amount chatter in the machining. Just shoot it and enjoy.
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Old April 10th, 2015, 05:50 PM   #12
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alright thanks for all the replies
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Old April 14th, 2015, 09:45 PM   #13
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Don't think the M&P89, G56, Ren Smith, and I are telling you that you shouldn't contact S&W about this, I'm just suggesting that we probably wouldn't. Here's the deal though: While we might be fine carrying that weapon, and that confidence may aid our performance (as opposed to hindering it), you have to be certain that your weapon is operating properly or you start from a position of diminished confidence.
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Old April 15th, 2015, 06:06 AM   #14
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I havent owned a private gun until this year since I live in Sweden and we have pretty strict gun regulations.
I have been issued guns and rifles throughout my service in the army (Swedish army versions of Glock17, Hk G3 and FN FNC).
If one of my service weapons looked like that I'd make a note of it for future checkups and just go with it. In my world it's a completely different story if a brand new gun is out of spec, even if it's just cosmetic. When I purchase something I want it to look new and within spec, no matter if it's a shirt, a computer, a car or a gun!
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Old April 19th, 2015, 07:38 PM   #15
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Quote:
Originally Posted by Kristian View Post
When I purchase something I want it to look new and within spec, ...
Minor milling marks don't necessarily mean "out of spec" or used.

Quote:
no matter if it's a shirt, a computer, a car or a gun!
or a working carpenter's hammer, that's already driven a couple/few thousand nails?

Last edited by KRWeiss; April 21st, 2015 at 11:40 AM.
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