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Smith & Wesson M&P Pistols All Variants of the Smith & Wesson M&P Auto Series


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Old 03-04-2020, 10:57 PM
dazlin dazlin is offline
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Hi,
I bought a police turn-in M&P 40 (1st gen) recently. After disassembly and cleaning I noticed a couple of things that were disturbing. Perhaps others can enlighten me if these are problems that I need to resolve before firing it?

Problem 1: There is a patina-like coating on several of the metal surfaces. It resists removal. Unfortunately, I can't determine if it is a real patina, fouling or rust. Attached pix show an example on the locking block.

Problem 2: After cleaning the barrel, I discovered some odd patches just after the end of the chamber. I can't seem to determine if this is normal or not. It doesn't look like fouling because it is too regular. Under a magnifier there appears to be parallel striations in each patch extending from one rifling groove to the next. But they are not consistent as they only appear at every other pair of rifling grooves. They are discolored but I cannot figure out if this is normal or not for an M&P barrel. Here are some pictures...
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Questions about a used M&P40-barrel-chamber-end-3sm-jpg   Questions about a used M&P40-barrel-chamber-end-2sm-jpg   Questions about a used M&P40-barrel-chamber-end-1sm-jpg   Questions about a used M&P40-locking-block-4sm-jpg   Questions about a used M&P40-locking-block-3sm-jpg  

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Last edited by dazlin; 03-04-2020 at 10:58 PM. Reason: tighten post
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Old 03-05-2020, 01:22 AM
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All patina is rust. Patina is only bad if there is pitting. I don't see any pitting on your gun.

I just looked a the bore of my .40S&W. It looks just like yours.

Go shoot your gun and enjoy angst free.
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Old 03-05-2020, 01:52 PM
spricks spricks is offline
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Looks like normal wear to me. Hard to even guess how many rounds have been through it. I would go ahead and make sure it functions without any problems....I'm thinking it will be good to go!

spricks
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Old 03-05-2020, 04:26 PM
Boogs Boogs is offline
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Barrel looks typical.

Hard to determine if it is rust, but as it was already stated, pitting is your concern.

I am definitely one that would go over a used pistol with a magnifying glass-- that is why I abstain from purchasing them

If it is going bang, enjoy it!
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Old 03-06-2020, 10:50 AM
BillyMagg BillyMagg is offline
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Quote:
Originally Posted by dazlin View Post
Hi,
I bought a police turn-in M&P 40 (1st gen) recently. After disassembly and cleaning I noticed a couple of things that were disturbing. Perhaps others can enlighten me if these are problems that I need to resolve before firing it?

Problem 1: There is a patina-like coating on several of the metal surfaces. It resists removal. Unfortunately, I can't determine if it is a real patina, fouling or rust. Attached pix show an example on the locking block.

Problem 2: After cleaning the barrel, I discovered some odd patches just after the end of the chamber. I can't seem to determine if this is normal or not. It doesn't look like fouling because it is too regular. Under a magnifier there appears to be parallel striations in each patch extending from one rifling groove to the next. But they are not consistent as they only appear at every other pair of rifling grooves. They are discolored but I cannot figure out if this is normal or not for an M&P barrel. Here are some pictures...
As our good friend Rastoff points out, you're good to go, nice pictures by the way...

I'm a little disappointed in some aspects of my own M&P .40 as far as fit and finish, it runs like a freight train though...
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Old 03-06-2020, 10:54 AM
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See what it looks like after a good session at the range.
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Old 03-06-2020, 01:08 PM
dla dla is offline
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The reamer they cut the leade with was a little rough IMO, but it would have zero effect on accuracy.

I say throw it in the dishwasher to clean the Cop boogers out of it, gently/lightly lube it, and then shoot the snot out of it for the next 20 years. Then post on how it is doing.
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Old 03-06-2020, 03:14 PM
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...I say throw it in the dishwasher to clean..
Is this a thing?
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Old 03-06-2020, 04:35 PM
seldon14 seldon14 is offline
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Quote:
Originally Posted by Boogs View Post
Is this a thing?

Depends on if you are married, or want to stay that way.
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Old 03-09-2020, 12:51 PM
dazlin dazlin is offline
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Thanks, everyone. I'll put some rounds through it and see how it goes.

BTW, the pictures were taken with my phone using the micro-focus mode. Adjusting the lighting until it looked good was the only other factor. The annotations and cropping come from the Snagit screen capture tool's editor.
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Old 03-27-2020, 09:04 PM
gnfrk gnfrk is offline
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Not sure if that is patina or not, I do know that if someone used a copper srubbing pad or copper brush to clean with you can get that "patina" look as the copper is soft enough to leave a little residue on the surface, just a thought
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Old 03-28-2020, 11:53 AM
hardluk1 hardluk1 is offline
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I don't see a thing unique aboput your photos to a good used M&P 40sw pistol except maybe a better lubes could have been used and it would have reduced the yoiur Patina what I'll call buffing of metal caused by the slides rails barrel lugs locking and unlocking over the years !! My daughter bought 4.25 40 with a thumb safety about 7 or 8 years ago for a house gun . She hated the trigger pull so I added a apex fss trigger kit and striker block kit and shoot about 6000 practice rounds threw it between her and her husband and son . She wanted to trade it for a 9mm she could carry easier so its filled her wish and the M&P 40 is mine now . Only change I made before shooting it was to add a heavier than gen 1 stock 20lb recoil spring . Glock recoil spring work in both 4.25 and 5" m&p's . Current 2.0 40sw use 20lb spring . Good pistol and a very good shooter with 165gr home loads .
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