[ER_STL]

What are these white dots on my barrel?

 

[YukonGlocker]

I don't know what those dots are, but it's not peening.

Peening, as it is referred to here, is the movement of metal. There has been no movement of metal.

 

[Fallschirmjäger]

Whatever it is....it's contagious!





I just had a look at my .40 an I have the same marks, in almost the exact same places 9, 11 and 2 o'clock on mine.

 

[jtaliani]

It looks to me to be nothing more then discoloration. I wipe my M&Ps down with a silicone cloth. Once the silicone is rubbed off or dries up I get similar marking. On mine it is nothing permanent and another wipe down makes it look like brand new.

 

[ER_STL]

Yeah, I don't feel a change in the surface of the metal at all. The gun has been cleaned a few times and I don't remember those spots being there when I first picked it up from the shop.



At any rate - I'm not too concerned about it as long as rust doesn't start developing there.

Whatever it is....it's congagious!



I just had a look at my .40 an I have the same marks, in almost the exact same places 9, 11 and 2 o'clock on mine.

Hey boss - same Fallschirmjager from the Fireblades site?

 

[texagun]

It is definately not peening.



Does it wipe off with an oily rag??

 

[Fallschirmjäger]

Not on mine.....neither oily rags, nor oily fingers. It appears to be where the underlying steel is showing through the blueing/blackening.



I'm thinking about going with a shiny muzzle.....just for grinz.

 

[Mad Max]

I had the same thing on my brand new 9c when I bought it. I think it's just uneven gun bluing by the factory. No performance issues.

 

[Fucilo]

My guess ....

Might it be exhaust debris from the muzzle blast? I bet that if you looked into the muzzle of the barrel with a flashlight, you'll see that these "dots" happen to be in-line with the barrels' rifling.

But ... is it LEAD (from the "lands") or POWDER (from the "grooves") ????

 

[gtmtnbiker98]

My M&P 9 barrel has the same marks. No big deal - my pistol is one accurate weapon.

 

[mike cyrwus]

that part of the barrel touches nothing, other than the bottom of a holster and whatever rug or case you put it in.

 

[ER_STL]

Two complaints I have against the M&P when I compare it to my Glock is the finish on the slide and the "dots" on my barrel. I have what looks like some sort of a machining rub on the slide that I thought was unique to my gun until I went to the shop and saw another like it. The dots -- while purely cosmetic -- do give the appearance of a poor finish when put together with the slide mark.



All that aside, the gun should still be a keeper as long as it continues to function as expected. After a lot of thought I'm sticking to my G19 as my carry gun but I'll probably throw my M&P in my glove-box on the days that I'm not carrying (I can't carry into work). I've heard that the cheapo Glock holsters that fit the G20/21 models fit the M&P9 well...