|
|
03-04-2020, 10:57 PM
|
Member
|
|
|
Join Date: Jan 2003
Location: Sammamish, WA
Posts: 41
Likes: 6
Liked 16 Times in 10 Posts
|
|
Questions about a used M&P40
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...
__________________
Gun Control: POA=POI
Last edited by dazlin; 03-04-2020 at 10:58 PM.
Reason: tighten post
|
The Following User Likes This Post:
|
|
03-05-2020, 01:22 AM
|
|
Member
|
|
|
Join Date: Dec 2011
Location: So Cal (Near Edwards AFB)
Posts: 14,710
Likes: 2,926
Liked 17,102 Times in 6,271 Posts
|
|
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.
__________________
Freedom isn't free.
|
The Following 8 Users Like Post:
|
|
03-05-2020, 01:52 PM
|
Member
|
|
|
Join Date: Jan 2010
Location: Wisconsin
Posts: 718
Likes: 1,157
Liked 771 Times in 273 Posts
|
|
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
|
The Following 3 Users Like Post:
|
|
03-05-2020, 04:26 PM
|
Member
|
|
|
Join Date: Jul 2019
Location: Illinois
Posts: 96
Likes: 13
Liked 44 Times in 30 Posts
|
|
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!
|
The Following User Likes This Post:
|
|
03-06-2020, 10:50 AM
|
Member
|
|
|
Join Date: Jun 2012
Location: Central Obamastan
Posts: 1,056
Likes: 16,788
Liked 803 Times in 419 Posts
|
|
Outstanding pictures
Quote:
Originally Posted by dazlin
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...
|
03-06-2020, 10:54 AM
|
|
Member
|
|
|
Join Date: Dec 2010
Location: Hills of North Georgia
Posts: 5,129
Likes: 1,853
Liked 12,472 Times in 3,411 Posts
|
|
See what it looks like after a good session at the range.
__________________
LIVE FROM THE DAWGHOUSE
|
03-06-2020, 01:08 PM
|
Member
|
|
|
Join Date: Feb 2010
Posts: 1,100
Likes: 326
Liked 468 Times in 278 Posts
|
|
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.
|
The Following User Likes This Post:
|
|
03-06-2020, 03:14 PM
|
Member
|
|
|
Join Date: Jul 2019
Location: Illinois
Posts: 96
Likes: 13
Liked 44 Times in 30 Posts
|
|
Quote:
Originally Posted by dla
...I say throw it in the dishwasher to clean..
|
Is this a thing?
|
The Following User Likes This Post:
|
|
03-06-2020, 04:35 PM
|
Member
|
|
|
Join Date: Mar 2011
Posts: 427
Likes: 88
Liked 399 Times in 197 Posts
|
|
Quote:
Originally Posted by Boogs
Is this a thing?
|
Depends on if you are married, or want to stay that way.
|
The Following 4 Users Like Post:
|
|
03-09-2020, 12:51 PM
|
Member
|
|
|
Join Date: Jan 2003
Location: Sammamish, WA
Posts: 41
Likes: 6
Liked 16 Times in 10 Posts
|
|
*nerd* *big*
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.
__________________
Gun Control: POA=POI
Last edited by dazlin; 03-09-2020 at 12:54 PM.
|
The Following 2 Users Like Post:
|
|
03-27-2020, 09:04 PM
|
Member
|
|
|
Join Date: Sep 2003
Location: Missouri
Posts: 102
Likes: 49
Liked 148 Times in 40 Posts
|
|
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
|
03-28-2020, 11:53 AM
|
Member
|
|
|
Join Date: Mar 2012
Posts: 1,833
Likes: 302
Liked 803 Times in 563 Posts
|
|
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 .
|
The Following 2 Users Like Post:
|
|
08-05-2020, 10:01 PM
|
Member
|
|
|
Join Date: Jan 2003
Location: Sammamish, WA
Posts: 41
Likes: 6
Liked 16 Times in 10 Posts
|
|
Just to close the loop... Took it out to the range and put a box of range ammo through it. Ran like a champ. A bit snappy. Nice trigger (wonder if it had a trigger job when it was a police gun?).
Now I just need to get new sights as the tritium on it is dead.
Thanks, all.
__________________
Gun Control: POA=POI
|
The Following 3 Users Like Post:
|
|
08-08-2020, 11:55 AM
|
Member
|
|
|
Join Date: Jun 2012
Location: Central Obamastan
Posts: 1,056
Likes: 16,788
Liked 803 Times in 419 Posts
|
|
Quote:
Originally Posted by dazlin
Just to close the loop... Took it out to the range and put a box of range ammo through it. Ran like a champ. A bit snappy. Nice trigger (wonder if it had a trigger job when it was a police gun?).
Now I just need to get new sights as the tritium on it is dead.
Thanks, all.
|
Thank you for closing the loop,, the .40 is a bit snappy, but my favorite auto pistol round, my M&P .40 has challenged me a bit. I don't get the kind of groups I would like, though at 15 yds I did have 3 out 10 in the same ragged hole? this was off a bag 0n the old truck hood, lol.
|
08-12-2020, 10:44 PM
|
Member
|
|
|
Join Date: Dec 2013
Location: Central Indiana
Posts: 1,868
Likes: 1,762
Liked 1,284 Times in 694 Posts
|
|
I bought a PD trade in M&P 40 a few years ago, very happy with mine. 40 isn't my favorite caliber, but it shoots as well as my FS 9 & 45. Factory or reloads, doesn't matter-shoots it all with no issues. Shoot, clean, repeat....and ENJOY!! :-)
|
08-13-2020, 07:06 PM
|
Member
|
|
|
Join Date: Dec 2011
Location: South Oregon Coast
Posts: 1,821
Likes: 89
Liked 1,654 Times in 585 Posts
|
|
To the OP. If you find it a bit too snappy you can always drop in a factory 9mm barrel. Must be more than a dozen members have done it (including me). Great for target practice.
|
08-13-2020, 10:20 PM
|
|
Member
|
|
|
Join Date: Oct 2002
Location: Keller, TX
Posts: 356
Likes: 216
Liked 499 Times in 206 Posts
|
|
The .40 M&P does the .40 caliber really well, and is a joy to shoot compared to some of their off brand counterparts.
|
The Following User Likes This Post:
|
|
08-15-2020, 02:32 PM
|
|
Member
|
|
|
Join Date: Aug 2004
Location: USA
Posts: 2,567
Likes: 6,532
Liked 4,340 Times in 1,595 Posts
|
|
The M&P .40 here is a favorite for both of us
Great caliber and one I like a lot and an added bonus is that you can still find ammunition for it. We have 6 pistols in the caliber.
__________________
KM
S&WCA 3110 S&WHF 625
|
The Following 3 Users Like Post:
|
|
08-23-2020, 07:32 PM
|
Member
|
|
|
Join Date: Feb 2005
Location: Sonoran Desert~Arizona
Posts: 219
Likes: 75
Liked 453 Times in 72 Posts
|
|
M&P40 - one of the best defense pistols you can buy. Shooting .40S&W 180 gr premium defense loads with this pistol is soft and sweet! 155 gr and 165 gr can feel a little harsh compared to the 180 gr. I like the 180 gr the best.
M&P40 Compact is very sweet, as well! I've had my M&P40 Compact since they were first released.... been a LONG time! Carried a lot, shot a lot. Love it.
Last edited by DHart; 08-23-2020 at 07:35 PM.
|
The Following 4 Users Like Post:
|
|
09-18-2020, 11:14 PM
|
Member
|
|
|
Join Date: Jan 2003
Location: Sammamish, WA
Posts: 41
Likes: 6
Liked 16 Times in 10 Posts
|
|
Quote:
Originally Posted by DHart
M&P40 - one of the best defense pistols you can buy. Shooting .40S&W 180 gr premium defense loads with this pistol is soft and sweet! 155 gr and 165 gr can feel a little harsh compared to the 180 gr. I like the 180 gr the best.
|
Well, my first pistol was a 40... a 1st gen Sigma. After it self-destructed with a case head separation, S&W replaced it with a new 2nd gen Sigma 40. Still have it and even used it in some competitions.
So far, the M&P40 feels good with its new night sights and a gun light.
Dan
__________________
Gun Control: POA=POI
|
|
Posting Rules
|
|
|
|
|