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M&P Shield 40s Are Exploding While Shooting

This is a discussion on M&P Shield 40s Are Exploding While Shooting within the Range Reports forums, part of the Firearm Forum category; A .40 doesn't operate at higher pressure. SAAMI PSI for the 9mm and .40 S&W is 35,000 psi according to the Speer manual....


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Old February 16th, 2014, 05:32 PM   #16
 
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A .40 doesn't operate at higher pressure. SAAMI PSI for the 9mm and .40 S&W is 35,000 psi according to the Speer manual.




Last edited by Sr40ken; February 16th, 2014 at 05:37 PM.
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Old February 16th, 2014, 06:17 PM   #17
 
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The most important thing is where is the brass it will tell the whole story not the gun . The brass will tell you if it is the gun or ammo .

A buddy of mine sent a Glock back for repairs he blowup . He told Glock he overloaded it . 2 weeks later Glock sent him a new gun FREE .
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Old February 16th, 2014, 06:21 PM   #18
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Quote:
Originally Posted by Tx gunrunner View Post
The most important thing is where is the brass it will tell the whole story not the gun . The brass will tell you if it is the gun or ammo .

A buddy of mine sent a Glock back for repairs he blowup . He told Glock he overloaded it . 2 weeks later Glock sent him a new gun FREE .
Wow! And they say no reloads. Sweet.

I guess he got the honesty award.
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Old February 16th, 2014, 06:52 PM   #19
 
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My son has the 9mm version. I haven't seen anything about this issue with the 9, so I hope it is just related to the 40. Still a bad deal. Lucky no one was hurt!!
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Old February 16th, 2014, 07:43 PM   #20
 
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I'm no gunsmith, but I thought about this some since I shoot a Shield 9. I don't see how a polymer firearm intrinsic malfunction can cause enough pressure in the R.grip to blow it partially off. I did some internet snooping and found Kabooms of this type are mainly due to cartridge problems, barrel obstruction etc. Glocks are famous for failing like this when the cartridge is double charged or with improperly loaded handloads (oversized bullets, double charge, wrong primer or powder etc.). They have the longest track record, so probably the most failures of this kind. I'm guessing a steel firearm won't kaboom like the Shield 40.

I did a stupid many years ago and fired a friends handloads in my 1911.. A light load caught the bullet in the barrel. I was doing rapid fire, and shot the next load which, of course, chambered. Bulged the barrel in the middle and blew the slide back to where the bushing jammed up on the bulge. The magazine got blown out. All kinds of debris imbedded itself in the celotex tile to my right that separated the booths. No significant injury though my ears were ringing right through the earmufs.
The second bullet cleared the barrel. I whacked the slide forward off the bulge and replaced the barrel and bushing. The pistol subsequently functioned fine. 1911s are tough hombres. (NEVER fire someone else's handloads, and maybe not your own in a semi-auto).

Anyway, I think if I was firing a Shield instead of a 1911, I wouldn't be surprised at all if the frame failed and part of it got blown off. Takes a lot of pressure to blow the magazine out. Probably enough to make a plastic frame fail.
Someone said that Glocks are buried in the mud for a long time, dug out and fired successfully; But I'll bet any barrel obstruction is carefully cleared before that's tried.

My long, windy 2c
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Old February 16th, 2014, 07:48 PM   #21
 
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After looking at the pictures, it looked like the barrel failed and when asked the OP confirmed it had. If I read it correctly.
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Old February 16th, 2014, 07:51 PM   #22
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Originally Posted by Sr40ken View Post
A .40 doesn't operate at higher pressure. SAAMI PSI for the 9mm and .40 S&W is 35,000 psi according to the Speer manual.
While the max pressure is the same, or very close, it is the curve that is drastically different. That's why the recoil of the 40 is so much harsher than a 9. I've never been a fan of polymer 40 cals, especially midget ones. I saw a glock come apart at a range right after I fired it and didn't like it... it was one of the early unsupported chambered ones years ago.
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Old February 16th, 2014, 08:10 PM   #23
 
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While the max pressure is the same, or very close, it is the curve that is drastically different. That's why the recoil of the 40 is so much harsher than a 9. I've never been a fan of polymer 40 cals, especially midget ones. I saw a glock come apart at a range right after I fired it and didn't like it... it was one of the early unsupported chambered ones years ago.
Well said. That's why after having a SR40 for a number of years (with several thousand down the pipe) I reverted back to the tried and true .45 AP in a 1911. Smoother shooting and I really didn't need to carry 15 rounds. Even tho the recoil wasn't bad at all to me I can get a 1911 back on target much quicker.
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Old February 16th, 2014, 08:22 PM   #24
 
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I went over the S&W forum notes. As I understand it, the ammo being used was very hot. Underwood +p or +P+. Interesting, since there is no +P or +P+ specs for .40 ammo. What was being shot?
S&W doesn't recommend this. Maybe that's why they are reluctant to accept responsibility.
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Old February 16th, 2014, 08:28 PM   #25
 
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As a man once aspiring to be president said, "well there ya go".
There is no free lunch.
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Old February 16th, 2014, 08:36 PM   #26
 
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Quote:
Originally Posted by normbi View Post
I went over the S&W forum notes. As I understand it, the ammo being used was very hot. Underwood +p or +P+. Interesting, since there is no +P or +P+ specs for .40 ammo. What was being shot?
S&W doesn't recommend this. Maybe that's why they are reluctant to accept responsibility.
I agree.

I think ultimately it will be determined that the ammo was to blame (based on my reading of the thread.)

Yup it was "factory manufactured" ammo but the specs on that ammo are in question due to a lack of a SAAMI spec.

If there is no spec for +p in .40 cal, how can it be labelled +p?

Just checked the Underwood site. 600+ ft/lbs for a .40 cal????? Yup it was hot ammo.

Last edited by mndoggie; February 16th, 2014 at 08:42 PM.
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Old February 16th, 2014, 08:39 PM   #27
 
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Not a huge fan of .40 or the M&P line in general, glad no one was injured. Gotta love it when people fire crazy ammo through their guns and blame the manufacturer when bad things happen.

It should still hold together, though. They proof (or should) those guns/barrels beforehand during testing.
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Old February 16th, 2014, 09:11 PM   #28
 
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I shoot .40 in my S&W M&P40 and it's really not that bad at all. I realize that the full size M&P40 is considered the lightest recoiling .40S&W but even so it doesn't seem like a high recoil round to me. I'm pretty suspicious about this supposed "rash" of KB's. The Shield has been out awhile and is extremely popular so if these .40's were exploding because of a handgun related reason there would way more than the "four" known incidents I keep seeing referred to.

I'm thinking these few cases are due to multiple causes and not bad guns. Most likely ammunition is the cause. Most KB's blamed on the gun are because someone used hot reloads, factory overcharged round, shooting someone else's ammo you have no control over, all kinds of stuff. Go do some research on rimfire guns letting go and read the details in each case, I did, and found almost every KB'd .22 on all these various forums had one thing that they all shared...they were shooting Aguila ammo. One guys gun blew and after Aguila checked the gun and the ammo he was shooting they said "our bad" and replaced his gun. Great customer service but how about recalling the ammo and stepping up QC? Apparently that wasn't in the cards, which is a reason why I never use Aguila but that's beside the point. All things considered at the moment it looks more ammo related than gun.

Even so you have people saying they'll never buy one of those or "that could have been me! I'm nervous to shoot my own gun now"...all kinds of stuff. We gotta be smarter than that.
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Old February 17th, 2014, 07:55 AM   #29
 
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After reading some post on the S&W form makes me wonder if its not the gun. Seems like to many failures from all over using factory ammo.
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Old February 17th, 2014, 08:18 AM   #30
 
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I think at this point in time, the root cause is still undetermined. It would take a concerted effort on the part of S&W and the ammo manufacturers to uncover the actual cause of these "events". I suspect that neither have much motivation to do so. However, it will be interesting to see if the repeated blame put on the ammunition by both S&W and forum members causes the ammo makers to stop recommending that their offerings be used in the Shield and/or become vocal in the defense of their product. Hopefully, the root cause will be identified and remedied before someone is seriously injured.
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