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Thread: Full Auto Problems - Cause and Solution?

  1. #21
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    Quote Originally Posted by ADC View Post
    I am talking about FULL AUTOs,...
    So am I.

  2. #22
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    Quote Originally Posted by Renegade View Post
    So am I.
    Glad you have had no problems with the issues I am speaking of.
    I also had a problem with our local police departments bran new Rock River 10.5 autos, out of 6 guns 3 were having problems choking up on auto fire, they would stop after3-4 rds, open them up, hammer fordward, live round in chamber, lite strike. Instaled H2 buffers, presto they all ran like a champ, full mag dumps!

  3. #23
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    Cool, will keep that in mind.
    BTW, newb question... Is there a corresponding, pre-set gas port size for every barrel length or will this also be dependent on the twist rate?
    Converted barrels are quite common where I live and this one gunsmith always plays around with the gas port on the barrel to ensure consistent full auto firing. -- These are usually 20" M16 barrels, 1/12 if Im not mistaken? converted to either 10.5" or 7". And also a few Wilson heavy barrels (14.5 I think) which I hear come with tiny gas ports, thus, having to be drilled further.

  4. #24
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    Quote Originally Posted by Col_Crocs View Post
    Cool, will keep that in mind.
    BTW, newb question... Is there a corresponding, pre-set gas port size for every barrel length or will this also be dependent on the twist rate?
    Converted barrels are quite common where I live and this one gunsmith always plays around with the gas port on the barrel to ensure consistent full auto firing. -- These are usually 20" M16 barrels, 1/12 if Im not mistaken? converted to either 10.5" or 7". And also a few Wilson heavy barrels (14.5 I think) which I hear come with tiny gas ports, thus, having to be drilled further.
    The twist rate dosent have so much to do with the gas hole size. What does is whether its a carbine/midlength or rifle system and how much barrel you have beyond the gas hole. If you cut your barrel down odds are you will have to drill out your gas port for dependable opreation with all or a given type of ammo.
    The military colt M4 barrels I have cut back to 10.5 I have drilled/reamed out the gas hole on the small size cause they were shooting mil. spec. ammo..................AD

  5. #25
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    Oh alright. In that case, are there specific gas port sizes that correspond to the different barrel lengths or do you resize until it works? I mean is there a guide you could follow as to how much to drill for a 14.5, 10.5 or 7?

  6. #26
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    Quote Originally Posted by Col_Crocs View Post
    Oh alright. In that case, are there specific gas port sizes that correspond to the different barrel lengths or do you resize until it works? I mean is there a guide you could follow as to how much to drill for a 14.5, 10.5 or 7?
    I am sure there is somewhat of an industry standard, however there are differances from manufacture to manufacture, like Colts mil. spec. M4 14.5 barrels have a smaller gas port hole than a bushmaster 14.5, the bushy will work with most all ammo on the market, Colt will not, as the military only uses mil. spec. ammo.
    So I would say to open your gas port to what ever ammo you plan to use. It seems that most of the commerical AR barrel makers use a gas port that will function even the weakest 223 ammo, so when mil. spec ammo is used its over gassed.

  7. #27
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    What about LMT and BCM? Are they known to have bigger gas ports to accomodate non-milspec ammo or are they exactly like Colt?

  8. #28
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    bolt bounce on gas piston carbine

    I am again faced with something new here at the shop. I have been given this problem to solve and it involves all the signs of bolt bounce but the difference with all other bolt bounce problems that we solved before is that this carbine is equipped with an Ares defense GSR-35 Black Lightning Kit.

    In all other bolt bounce problems that we encountered, we attributed the culprit to be too much gas, such so that we always reduce the port hole size by TIG welding the hole and drilling it again starting with a .0625" drill bit and just increasing it until the weapon cycles properly.

    My question now is, Would this weapon that is equipped with a gas piston kit be also suffering from too much gas?

  9. #29
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    I would say that yes the Aries could suffer from over gas just like the DI system. What I would wonder is how did the designer of the Aries deal with the different gas port holes sizes in different barrel manufactures? A bigger port hole means more gas and a smaller means less gas. Before I welded up a gas port and redrilled it, I would try heavier buffers, if it has a problem with bolt bounce and you are running a standard buffer try a H or H2. You could also try a different ammo, some 223 marked ammo is weaker than Mil. spec. ammo.

  10. #30
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    Quote Originally Posted by Col_Crocs View Post
    What about LMT and BCM? Are they known to have bigger gas ports to accomodate non-milspec ammo or are they exactly like Colt?
    I dont know about LMT, but most of the bushmaster barrels I have had the front sight off of have a bigger gas hole than a mil. spec Colt M4

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