Who can help with my AR-15 problem?

BULLETTOOTH

BULLETTOOTH

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hey guys, I have just purchased a Smith and Wesson M&P15, took her to the range and fired three shots, each shot fired I have had to punch the casing out with my cleaning rod, looks like the extractor is grabbing the brass and tearing a chunk of the lip off, and it stays in the barrel., I cleaned the gun before the first shot, its REM 223 quality ammo, don't know wtf the problem is, gas problem? extractor problem? from the first shot!!!!, other than bring it back, or send it out, what am I missing here guys? any ideas on how i can fix it myself?
 
Check to make sure there is a spring and rubber under the extractor.
Take a round and push down on the ejector make sure there is movment allso look in the chamber make sure they is not a bur or damage
 
Is the chamber rough? Any rust or pitting or machining marks in it? If not, was the bolt carrier and cam pin well lubed?

Have you tried any other ammo?
 
sounds like the extractor is doing its job but the case is stuck in your chamber. get an ar chamber brush and go at it. had the same problem with svt40 cleaned the chamber and everything started to work
 
thanx guys, no pits or marks that i can see?, its obvious that it is trying to pull the casing, thats why its ripping the lip off, but when i go to knock out the case with a rod it just pops out with a little tap? its not in their very tight at all?, i will have to check for the spring and rubber under the extractor, i dont remember seeing any when i took the carrier out?
 
ok, and i was going to take the ejector out to have a look, and why the hell are the bolt carrier key screws peened so i cant take them out?, is that a canadian thing? or manafactuar for warenty maybe?
 
Not understanding, you can't rotate it at bottom of the "L" to remove the actual bolt itself? You should be able to take it down to bottom, rotate 90 degrees and some slight motivation to lift it out, then pull the bolt itself straight outwards, then the ejector should be able to be removed by just pushing out the pin.
 
Remington doesnt make quallity ammo IMO
Brass pops out easilly as it has cooled enough that it would probably fall out if you tapped side of rifle with your hand muzzle faceing up.
Incorrect gas key secureing or inncorrect lubeing would be my first guess.
Gauge you chamber and that will tell you if its too tight/out of spec.
Is this a new rifle?
 
gas key is staked to eliminate them comeing loose during fireing. If that gas key comes loose things get ugly real fast.Do NOT remove untill you know what you are doing.
 
BULLETTOOTH said:
ok, and i was going to take the ejector out to have a look, and why the hell are the bolt carrier key screws peened so i cant take them out?, is that a canadian thing? or manafactuar for warenty maybe?
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The pin to remove (^) is in the centre on the side. You should be able to just push it out with a thin allen wrench. You don't want to touch the screws on top.
 
BULLETTOOTH said:
ok, and i was going to take the ejector out to have a look, and why the hell are the bolt carrier key screws peened so i cant take them out?, is that a canadian thing? or manafactuar for warenty maybe?
Click to expand...

Staking the gas key screws is one of the things to look out for in a properly built AR. If they aren't staked, they will loosen. Loctite doesn't cut it as a substitute. The gas key doesn't need to come off for normal maintenance.
 
The prob is chamber related. It is dirty, full of goop or sticky crap or it is rough. That causes the case to grip the banner wall under pressure which results in the extractor tearing off the rim. Once the pressure has dropped, the case contracts and can pop out easily.

As others have noted, you don't take the carrier key off under normal circumstances.
 
Yes ( to awnser a bunch of questions), it is a brand new gun, first shots these problems happened, the screws I'm the key are punched so they can't come out if I wanted to, and the key interferes with the can pin, won't allow me to take it out unless the key was removed?(when I slide it back) I am thinking a gas problem to heckler, seems like the extractor is pulling to early, not giving the caseing time to contract after expanding while fireing?, dose that make sence to anyone?, thanx again guys for all your input
 
Oh and thanx for the response on the screws, lol glad they are punched or I will have takes them out already, I will try again here to pull the can pin out, once I pull the bolt out what ami looking for that might be the problem? , can't believe how helpful you fellow cgn's are...
 
just clean your chamber dude. Suputin is right.
BULLETTOOTH said:
Yes ( to awnser a bunch of questions), it is a brand new gun, first shots these problems happened, the screws I'm the key are punched so they can't come out if I wanted to, and the key interferes with the can pin, won't allow me to take it out unless the key was removed?(when I slide it back) I am thinking a gas problem to heckler, seems like the extractor is pulling to early, not giving the caseing time to contract after expanding while fireing?, dose that make sence to anyone?, thanx again guys for all your input
Click to expand...
 
BULLETTOOTH said:
Oh and thanx for the response on the screws, lol glad they are punched or I will have takes them out already, I will try again here to pull the can pin out, once I pull the bolt out what ami looking for that might be the problem? , can't believe how helpful you fellow cgn's are...
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Once the firing pin retainer and firing pin are out, push the cam pin back and toward you (the back and bottom of the slot), then turn it sideways to lift it out. I'll defer to the experts and suggest the chamber is the source of your problem.
 
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ok, thanx for explaining that, good thing they are or i would have removed them, ok so once i get the bolt out, what am i looking for that might be my problem?, is it possable that it is a gas problem? its almost like the extractor is trying to pull the casing before it has time to contract after fiering?,
 
BULLETTOOTH said:
ok, thanx for explaining that, good thing they are or i would have removed them, ok so once i get the bolt out, what am i looking for that might be my problem?, is it possable that it is a gas problem? its almost like the extractor is trying to pull the casing before it has time to contract after fiering?,
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For the bolt, once you get it out, check that the ejector is springy. Ensure the extractor moves. It might or might not have crane o-ring under the extractor, but even if it does not, I doubt this would give you the symptoms you are seeing. If it does have one though, it wouldn't hurt to install one (you have to drive the extractor pin out to do this).

Ensure the gas seal rings do not have holes lined up. Even if they are, the bolt will usually still work OK, but good practise to space them apart.

Now blow on the hole in the gas key to verify it is not obstructed.

If all those things ckeck out, re-assemble the bolt carrier group as it's likely OK.

Before shooting, lube the living crap out of the sides of the gas key, the cam pin and the bearing rails on the bolt carrier. In my experience, many (most?) Ar15 failures are related to insufficient lubrication.

Use a good runny gun oil like Hoppes, Remoil, CLP, etc.
 
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