What is causing this? (M & P 40) - Chicagoland Sportbikes
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post #1 of 18 (permalink) Old 05-09-2012, 05:05 PM Thread Starter
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What is causing this? (M & P 40)

This gun my brother originally bought as his duty weapon in middle 09. He kept having problems with it failing to go into battery so he switched to glock after the academy. He sent it back to S&W and they sent it back saying it was fixed. He has shot several types of ammo and tried brand new magazines and still the same problem. He has shot it once since getting it back and we shot it again today. This is what we got six times in 3 magazines. Any insight is welcome.








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post #2 of 18 (permalink) Old 05-09-2012, 05:33 PM
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Where is it catching exactly?

Have you tried some brass instead of steel ammunition?

If you take the barrel out, can you drop a round in the chamber by hand without it hanging up? It should go in smoothly and make a plunk sound.

If the chamber checks out OK, I'm going to say it's possibly a mag issue. The feed lips might be bent not allowing the round to hit the ramp and enter the chamber at the right angle. The follower could be backwards or weak spring or something goofy as well. Try different mags and different ammo. It may just be a picky bitch.

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post #3 of 18 (permalink) Old 05-09-2012, 05:54 PM Thread Starter
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This is aluminum cased ammo. It has done this with lawman brass and WWB. It did this with the original three magazines and with three brand new ones. Round drops free into the chamber no problem.

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post #4 of 18 (permalink) Old 05-09-2012, 07:56 PM Thread Starter
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No burs on the extractor. Field stripped and put a round behind the extractor claw. Kind of have to force it in there and it will not come out when shaken violently. My glock it slides right in and will come out when shaken violently. So maybe extractor spring tension?

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post #5 of 18 (permalink) Old 05-09-2012, 08:58 PM
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Not always the case as the rim of the case slides behide the extractor. it's a timing issue when it comes to the rim going behins the extractor with the gun going into battery. I posted a video on a different thread earlier this year if you wanna look that up. Use your finger to press against the extractor, even if you have to oush hard if the extractor budges at all your ok. From what you desrcibed and what it looks like I would be checking the feed ramp and chamber on the barrel. If the barrel is not ramped properly or the chamber not throated right this could very well happen. One way to check this would be if you have someone else with the exact gun toss their barrel in your gun and fire it.

Anyway you can get a pick of the barrel for me?

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post #6 of 18 (permalink) Old 05-09-2012, 09:31 PM Thread Starter
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I haven't cleaned it just wiped it down for the pic.


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post #7 of 18 (permalink) Old 05-09-2012, 09:52 PM
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post #8 of 18 (permalink) Old 05-09-2012, 09:55 PM
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here's what I had to do to a glock of mine to get it working 100%. Based on the picture you posted there are a few spots I would hit on that barrel.

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post #9 of 18 (permalink) Old 05-09-2012, 10:03 PM
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i would break the edges at the red arrows, open up the chamber a hair and blend. Clean up teh ramp and make sure it was rolled into the chamber nice and clean at the green arrow.

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post #10 of 18 (permalink) Old 05-09-2012, 10:11 PM Thread Starter
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Ok thanks alot!

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post #11 of 18 (permalink) Old 05-14-2012, 08:25 AM Thread Starter
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Borrowed a barrel from a reliable m&p and going to take it out Wednesday or Thursday and test it out.

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post #12 of 18 (permalink) Old 05-14-2012, 09:38 AM
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With 40S&W it is usually ammo. Every 40S&W i have owned over the years has had feed problems with various different target loads. I find that using HPs is better for feeding in the 40SW cal, but then again I reload.

Judging by the pictures, I would say 100% it was the ammo (steel cases are crap also).

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post #13 of 18 (permalink) Old 05-14-2012, 10:28 AM
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Jesus fucking Christ, where to begin:

1) If EVERY .40 you ever owned had problems I would quickly diagnos this as operator error. Especially since you said you reload.

2) As ZBU is a cop I highly doubt he's looking at making his gun reliable with "target loads"

3) As the majority of PD's now use the .40 do you believe they would pick something as prone to failure as you describe the .40?

4) That Aluminum CCI blazer, get your shot straight.

Zoom, let me know how things go

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post #14 of 18 (permalink) Old 06-13-2012, 04:16 PM Thread Starter
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Finally had a chance to test it with a new barrel today. I shot 50 rds of the aluminum blazer, 46 rds of Winchester rangers, and 50 rds of federal brass. It had the same malfunction as above 8 times. Seven of them were with the aluminum with both the barrels. One was with the JHP with the new barrel. No malfunctions with the brass. The other times it did it with brass was with lawman fmj. It malfunctioned with all three magazines that I had. Gun was clean and oiled before this trip.

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post #15 of 18 (permalink) Old 06-13-2012, 04:28 PM
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I would send it back and call smith again
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post #16 of 18 (permalink) Old 06-13-2012, 05:04 PM
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Blazer feeds like crap in some Semi's.

Polishing the feed ramp could help.

Sending it back to S&W might be the right choice.



Q: Does the slide seem free through battery ? It's not hanging up or binding the spring is it ?



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post #17 of 18 (permalink) Old 06-13-2012, 05:31 PM Thread Starter
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Quote:
Originally Posted by BLARNEY View Post
Blazer feeds like crap in some Semi's.

Polishing the feed ramp could help.

Sending it back to S&W might be the right choice.



Q: Does the slide seem free through battery ? It's not hanging up or binding the spring is it ?



Tom
The feed ramp on the old barrel is already polished from the first time it went back to S&W. The slide cycles freely.

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post #18 of 18 (permalink) Old 06-14-2012, 04:52 AM Thread Starter
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I forgot to add I had one of the rangers hit me in the face. That was a first.

"There are no men more ignoble or more foolish, no men whose actions are fraught with greater possibility of mischief to their country and to mankind, than those who exalt unrighteous peace as better than righteous war." - Theodore Roosevelt
"I will bleed on the flag to keep the stripes red!"
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