Wondering what you found out? This one has me concerned because what I said is exactly what it sounds like. You can spray the stuff down the gas tube and if it runs outside the barrel then you have an obstruction in the gas block. Just wondering?
M&P15 Sport Malfunctions
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mstewart440
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Long overdue update here. Work/kids sports/wife/life have kept me from spending any time on fun stuff. I took the above advise and disassembled it, cleaned and lubed everything again (including the BCG). This past weekend I got a chance to shoot it again and its still a single shot. The difference is, the spent casing was not difficult to extract manually. The fact that it was easy to extract and the rifle hadn't made any attempt to do it itself lends alot of credibility to the gas system theories.
S&W said it would be 3 month turn around if I want to send it in...no thanks.
So how does one go about troubleshooting the gas system?
S&W said it would be 3 month turn around if I want to send it in...no thanks.
So how does one go about troubleshooting the gas system?
cyphertext
US Veteran
Ya know, had you sent it in when you first had the problem, the rifle would have been back already. I would just send it in. You could fool around with it for another month or two and still not be any better off.
It sounds very similar to the problem I had with my 15x, anything in 5.56 failed to eject. I would have to use my cleaning rod to push the cartridge out. While at the range in the gun shop where I bought it the range officer took it to the gunsmith. He cleaned it, and said everything looked fine. Still failed to eject. I changed the ejector spring, the ejector and swapped another working BCG, failed to eject. I notified S&W and they suggested Winchester white box, not easy to find. I found some online for a ridiculous price, failed to eject. Picked up some Hornady and PMC, failed to eject. Sent them another email and they sent me a FedeX label, 3 weeks to the day, my rifle was back. They honed the chamber and swapped the ejector. The gun runs like a champ, I still had my loaded mags that failed before and blew threw all of them, no hiccups. Since then my gun eats anything I feed it.
take a can of spray solvent with a red spray nozzle, separate the upper from the lower and remove the BCG and charging handle and squirt some of the solvent into the gas-tube while holding the muzzle down, do it outside or over a container to catch the run off. You are looking to see the solvent run out the end of the barrel, muzzle end. You do not want to see it coming around the gas block or front sight base. and be careful to not overflow the tube or it will be hard to tell where it is coming from. If it doesnt run out the muzzle of the barrel then your gas system is plugged...also look at the little periscope looking thing on top of the bolt carrier, that is the gas key, make sure there are not holes in it. That is the best way I know to troubleshoot the gas system.
good luck and let us know...
rojodiablo
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The rifle in question is a Sport. It has a melonited barrel, and is not chromed. If a chamber needs honing, you are tuning up the rough chrome in the chamber, as the chrome will follow any contour in there. It gets done all the time, take a bore hone and polish it a bit.
I didn't think that the Sport has a chrome chamber. I do totally agree with rojodiablo about being able to hone the chamber. Due to the thickness of the melonite treated layer in the barrel a hone should not remove it but just polish it. If a person were to hone it enough to remove the layer of treated material the chamber would be so over-sized that it would make the barrel unserviceable. If I have read this thread correctly, the OP is able to use his charging handle to remove the fired casings with little to no difficulty, so I am still of a mind that there is a problem in the gas system.
ZeroTolerance6
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My Sport had the same condition after I swapped out the front A2 sight with a low profie gas block.
The idiot who swapped it out (me), failed to perform the simple test that Grover described above. Once aligned properly, the solvent ran out the barrel...problem solved.
The idiot who swapped it out (me), failed to perform the simple test that Grover described above. Once aligned properly, the solvent ran out the barrel...problem solved.
andyo5
Member
If the case swells anywhere near a millieter, it is way too much.
A millimeter is 40 thousandths of an inch. That is huge in terms of case swell.
I think that your chamber is probably oversized, allowing the brass to swell past the elastic point (point where it mostly recovers its shape after the pressure drops). Try lubing one of these swollen cased and running it through your sizing die, if you are a reloader. If it is a real bugger to resize, them I'm right.
A millimeter is 40 thousandths of an inch. That is huge in terms of case swell.
I think that your chamber is probably oversized, allowing the brass to swell past the elastic point (point where it mostly recovers its shape after the pressure drops). Try lubing one of these swollen cased and running it through your sizing die, if you are a reloader. If it is a real bugger to resize, them I'm right.
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