AR-15T Jamming

[spanishcop]

About 30% to 40% of my rounds were jamming on my brand new AR-15 Tactical 2nd Generation. I'm not sure what is causing it. I have tried 3 different kinds of ammunition and several different P-mags including the one that came with the rifle. The bolt is extracting the round from the magazine properly and bolt is lined up ok with the back of the casing but it is jamming about 80% of its way in. When I lock it open again, the round will fall out on its own with no problem when I tilt it to the side.

The rounds that jammed have a scrape on the same side as the ejector opening and you can see a light film that the casing is covered with that is scrapped back with a small oval(around bullet) only the scrapped area.

I will try to post picture of the casing. Now if I put that round back in the mag and run it again, it will not jam that round.

PICTURE: http://www.flickr.com/photos/93133571@N08/8460044332/in/photostream

I have tried Hornady, PMC and American Eagle all 55gr rounds. My Sgt. happen to be at the range also and tested his mag that works flawless with his M&P AR15 and no problems and it jammed on mine again several times.

We also compared the spring in the buffer tube and noticed that mine (Brand New) is about 1in shorter than his. We tried his spring in mine and it still jammed.

Has quality control maybe went down for S&W due to the large demand and trying to rush orders? I have trust in S&W and I'm sure they will take of me. I just hate the thought of having to send it back in.

Any suggestions?

 

[PG Wootown]

What do your feed ramps look like? Looks like an engagement/feeding issue. May want to call Smith. They may have you ship it back for repair.

 

[spanishcop]

My Sgt. is a S&W Armorer and he didn't see what might be causing the issue. He advised to contact Smith&Wesson. I received a call from the gun shop where I purchased it and they were going to ship it out for me. I was just hoping that there was an easy fix.

 

[spanishcop]

I was doing some research online and I saw someone put this comment on another forum which may be my problem...

"I It looks like the locking lug spaces in your feed ramps are very sharp. As you shoot they are likely shaving off a little material each time. To test for this you can load up some dummy rounds with clean polished brass and new bullets (no primer or powder). Load about 10 then cycle them through the rifle. Then look at the bullet and case to look for deep cuts and scratches. Chances are you'll have them. The cure is to take a needle diamond file and break the edges in the square cuts in your feed ramps."

I'm thinking I'm better off letting s&w handle it. Don't want to void warranty filing this thing and not be the issue.

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[Jswiney9]

what do your case rims look like? could be a multitude of things.

 

[Jswiney9]

I was doing some research online and I saw someone put this comment on another forum which may be my problem...

"I It looks like the locking lug spaces in your feed ramps are very sharp. As you shoot they are likely shaving off a little material each time. To test for this you can load up some dummy rounds with clean polished brass and new bullets (no primer or powder). Load about 10 then cycle them through the rifle. Then look at the bullet and case to look for deep cuts and scratches. Chances are you'll have them. The cure is to take a needle diamond file and break the edges in the square cuts in your feed ramps."

I'm thinking I'm better off letting s&w handle it. Don't want to void warranty filing this thing and not be the issue.

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Did you look at your feed ramps to see if they were proper?

 

[Maddmax]

I'm thinking I'm better off letting s&w handle it. Don't want to void warranty filing this thing and not be the issue.

Ship it back to the Mother Ship for repair. They pick up shipping both ways and it's covered by the warranty. Only thing,it will be gone. But S&W is quick and good about fixing things.

 

[spanishcop]

I marked the rounds with an x and o to show top of bullet and bottom of bullet. And the scratching is happening in between the marks on the same side as the opening to eject casings.

I also noticed on the rim of the casing there is an impression on the edge as well.

The round is getting stuck about 2/3s in. I can still see part of the casing when it is jammed.

Here is a pic of the indentation on the rim. The indentation is on the top

Here in this pic you can see indentation is on the lower part yet the scrape on top.

Now if these rounds were in my rifle jammed, the scrape would be facing the opening where casings are ejected and the indentation on the rim would be on the inside of the rifle.

I've never had to send a weapon in for service. I hope S&W will make it right and not take too long to return it. I've already made arrangements with my gun shop where I purchased it to send it back.

Mike

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[batmann]

It could be a couple of things, but the best advice is to bite the bullet (pun) and send it back to S&W. IF you try something yourself to fix the problem and run the chamber or bolt face, you may have to pay for any repairs Smith does.That is why I bought a S&W----warranty.

 

[Maddmax]

Keep us posted on your progress and what S&W says it was.

 

[StlBluesFan72]

Had that exact problem on my OR model. Mine was actually bending the cases at that spot and not just scrapping them. I sent it in, and I got it back with a slip and all it said was "chamber tolerance / replace bbl." It has worked perfect ever since. Send it in!

 

[spanishcop]

I never provided an update on this... Sorry.

I sent the rifle in to Smith & Wesson. After getting the rifle back from them, I was advised that it was a bad Extractor. In my mind it didn't make sense, but that's what they said.

The good thing about it, is that it works perfect now and will eat up any kind of ammo. I'm very pleased with the rifle. Just this minor hick-up from the start, but all is good.

Mike

 

[apollolanding]

Glad to hear S&W made it right. My 2nd gen 15T has had a few quality control... Blips. Nothing that effected functionality, it eats everything and puts them where I point it but a few bolt engagement surfaces has nicks. Nothing I had to take a file to but they did get a light rub with a soft Arkansas stone. The feed ramps aren't exactly perfect. It chambers everything but soft-nosed rounds get buggered up a bit. I discovered that after having to chamber and clear the same round 3 times (not a weapon or ammo issue, it was a range safety issue) so part of that bug is on me. I'm running at least 1000 rounds through it before I have anything worked on. It's running smooth and my brass is only lightly scratched on a few rounds so no need to smith just yet.

 

[Waywatcher]

It is said that if an AR is malfunctioning; start with MEAL
Magazines,
extractor,
ammunition,
lubrication.
From your posts, it sounds like you had magazines and ammuntion ruled out already.

I love happy endings!

 

[thecatch8]

I guess this is a bi-product of the random inspection process on the assembly line.....it happens!

 

[Vic 103]

I was advised that it was a bad Extractor.

It kinda makes sense from the one picture of the bolt and chamber. It looks like the extractor is frozen down so it wouldn't lock over case lip, so the round is not located in the bolt properly and forces the round into the chamber at angle causing the line (dent) and scrape on the brass. Also the dent on the rear is from the ejector not seating right.........I think.

 

[Rastoff]

Vic 103 nailed it. That's exactly what was happening.

 

[spanishcop]

It kinda makes sense from the one picture of the bolt and chamber. It looks like the extractor is frozen down so it wouldn't lock over case lip, so the round is not located in the bolt properly and forces the round into the chamber at angle causing the line (dent) and scrape on the brass. Also the dent on the rear is from the ejector not seating right.........I think.

Thanks for the breakdown. That was explained much better than what S&W did for me. Thank you.


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