Please help my ar-15 is broken

dangertree said:
-Is your gas tube correctly aligned?
-Is your gas port correctly sized?
-Is your receiver NOT crushed, preventing free movement of the bolt carrier?

It isn't due to buffer weight, etc.

If your smith used the same sized gas port as was on your longer (16?) barrel, it is not going to work, it will be undergassed, and will not eject/cycle. If your bolt moves freely, I'd look at the gas port.

Your smith should fix this for you.
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Exactly! This has nothing to do with buffers. Methinks you might want to ake it to another smith though, as I have a feeling this guy might try and do a sloppy guess-and-check deal with the gas port.
 
It's a port pressure issue, meaning that the bullet is leaving the barrel sooner, as soon as that happens, pressure drops dramatically, instead of continuously supplying the operating system with propellant gases. You can't just chop down a barrel and expect it to work. There are some precise calculations and ratios that you have to maintain.
 
See I knew some of the issues of a 10.5inch barrel going into it but I never thought that I would have to tell a man who is A REGISTERED GUN SMITH how to do his job. I mean I don't tell my dentist which teeth have cavities nor do I tell my doctor what medication I should take. I trusted someone who advertise themselves as a professional and got deceived big time I don't know if I can ask for my money back though because work was done to the rifle. All else aside I am very happy with all the responses I have been getting and all the help from you guys I think I have found some good people to help me with this problem.
 
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Gun designs differ so much that just because a guy can smith some types of guns, doesn't mean he's competent in all guns. It's like expecting a car mechanic specializing in on manufacturer to be know his way around every single car make in the world, just because he's a professional.

bobbyhill said:
See I knew some of the issues of a 10.5inch barrel going into it but I never thought that I would have to tell a man who is A REGISTERED GUN SMITH how to do his job. I mean I don't tell my dentist which teeth have cavities nor do I tell my doctor what medication I should take. I trusted someone who advertise themselves as a professional and got deceived big time I don't know if I can ask for my money back though because work was done to the rifle. All else aside I am very happy with all the responses I have been getting and all the help from you guys I think I have found some good people to help me with this problem.
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FPembleton said:
Gun designs differ so much that just because a guy can smith some types of guns, doesn't mean he's competent in all guns. It's like expecting a car mechanic specializing in on manufacturer to be know his way around every single car make in the world, just because he's a professional.
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Yes, but this guy should have refused to do the work or subcontracted. Who did the work? Seems pretty shady to me....
 
I wouldn't suggest using your style of diplomacy on the gunsmith. Just chase him down and take some ass whopping with you.
 
Here's my $0.02...It could be as simple as having the gas tube not installed properly. Sometimes it requires a fair amount of force to push the GT fully into the front sight base. If not fully seated, the hole in the GT and the FSB don't line up properly and voila, you have a single shot rifle. Since the tube isn't seated all the way, the little roll pin that is supposed to hold the GT in place, goes right in front of the end of the GT, given the appearance that all is well :rolleyes:
 
RifleDude said:
Here's my $0.02...It could be as simple as having the gas tube not installed properly. Sometimes it requires a fair amount of force to push the GT fully into the front sight base. If not fully seated, the hole in the GT and the FSB don't line up properly and voila, you have a single shot rifle. Since the tube isn't seated all the way, the little roll pin that is supposed to hold the GT in place, goes right in front of the end of the GT, given the appearance that all is well :rolleyes:
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You should be fired if you take money and make this mistake!! You must not be watching TV while you are "gunsmithing".

Hell, this is not even "gunsmithing". THis is just armourer's job.
 
RifleDude said:
Here's my $0.02...It could be as simple as having the gas tube not installed properly. Sometimes it requires a fair amount of force to push the GT fully into the front sight base. If not fully seated, the hole in the GT and the FSB don't line up properly and voila, you have a single shot rifle. Since the tube isn't seated all the way, the little roll pin that is supposed to hold the GT in place, goes right in front of the end of the GT, given the appearance that all is well :rolleyes:
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If it is partially extracting the round, it's getting some gas.

I'd bet $1 that the gas port is undersized.
 
I got my Ar-15 back and she works perfect now thanks to Casey Brouwer
www.TacOrd.com. I was very impressed with the service he fixed it in 1 day, not 2 months like the other "smith" and he even cleaned it for free(I hate cleaning). The gas port size in the barrel was the problem it turned out to be .0625. the correct size should have been 076. Thanks for all the help guys
 
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