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Thread: Popularity of the 12.5" carbine-gas SBR?

  1. #61
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    Hodge Defense 12.5" carbine gas barrel (.068" GP) 21.00oz and Noveske 12.5" carbine gas barrel (.071" GP) 23.10oz:




    Last edited by jerrysimons; 03-23-17 at 10:39.

  2. #62
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    I like the closer to .065" porting for the Hodge, but I'm not so sure about the steps in contour profile over a more radiused barrel contour as far as deflection goes. Adding more of a radius can help a few things and remove some variables. It's more difficult to manage the deflection issues when a system is more like a chain link, and less than a solid rod. A very similar profile could be had with more radius with a minimal change in weight.

  3. #63
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    Quote Originally Posted by jerrysimons View Post
    Hodge Defense 12.5" carbine gas barrel (.068" GP) 21.00oz and Noveske 12.5" carbine gas barrel (.071" GP) 23.10oz:





    Any comparison shots of these two barrels next to a Centurion Arms 12.5" lightweight barrel?
    "We sleep soundly in our beds because rough men stand ready in the night to visit violence on those who would do us harm."

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  4. #64
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    Quote Originally Posted by drtywk View Post
    Any comparison shots of these two barrels next to a Centurion Arms 12.5" lightweight barrel?
    No but I think Rainier Arms has you covered. It looks quite similar in shape to the Noveske 12.5" but is just a little less thick (though I can not tell if it is thinner behind the gas-block than in front of it from the pic, the difference between a taper and a lightweight govt. profile?). It weighs 21oz and has a gas-port of .065" per reports from owners here. Also it also a slight taper bore in addition to being made out of FN CHF "machine gun steel" with thicker chrome lining like the Noveske.


    https://www.rainierarms.com/centurio...-barrel-12-5lw
    Last edited by jerrysimons; 03-27-17 at 12:24.

  5. #65
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    Quote Originally Posted by jerrysimons View Post
    No but I think Rainier Arms has you covered. It looks quite similar in shape to the Noveske 12.5" but is just a little less thick (though I can not tell if it is thinner behind the gas-block than in front of it from the pic, the difference between a taper and a lightweight govt. profile?). It weighs 21oz and has a gas-port of .065" per reports from owners here. Also it also a slight taper bore in addition to being made out of FN CHF "machine gun steel" with thicker chrome lining like the Noveske.
    According to Monty himself:
    Quote Originally Posted by grinch View Post
    The light weights are gov profile under the hand guard and step down to .680 in front of the gas block. The mid weight is .750 under the hand guard and .740 in front of the gas block.
    I was told by one of the designers behind the Hodge barrel that it is a continuous taper except at the gas block journal.
    Plus ça change, plus c'est la même chose.

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  6. #66
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    Quote Originally Posted by Defaultmp3 View Post
    According to Monty himself:


    I was told by one of the designers behind the Hodge barrel that it is a continuous taper except at the gas block journal.
    Cool, thanks. I can kinda see that about the Hodge barrel in my top comparison pic, except for the muzzle flare too, which in addition to providing a muzzle device shoulder makes it to where the barrel doesn't look anemic for the little portion that sticks out between the end of the 11.5" wedgelock rail and your gun muffler.

    I think Tom12.7 is saying he doesn't understand why there is not a radiused ramp down from the gas-block journal to the thinner front section of the barrel.

  7. #67
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    The transitions in the barrel exterior profile would ideally be matched to compliment a total defection curve, over a stepped one that adds fulcrum points. Additional points adds in more variables, that is another unknown to try to avoid getting into if we can. Sure, there are some things that we can do to minimize these on the transitions. We can preload a step down within an outer diameter reduction with either preload statically, or a few other things like limiting dynamic movement within the deflecting system. Another argument may be to limit the effect of a reduction in barrel OD by not making that OD as large and reducing the transition.
    The base AR does not barrel whip like a conventional bolt gun. The gas tube exerts a similar force from the pressure to the key as a piston gun, the relative amount is lower with DI as the work is done differently than a normal piston gun, the effects are similar though.
    Ideally, an AR barrel would have a profile that loads the OD reduction transitions with a minimal mass change from the base barrel. No bumps in a mass increase with a proper preload for those that do for a smoother transition down the length of the barrel. Adding in a bump in the barrel defection in the beginning or the end is much easier to deal with than one with bump(s) in the middle.
    Would anyone want to look deeper into these things?

  8. #68
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    So this thread has me wanting to build a 12.5". Damn....
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  9. #69
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    That hodge looks a lot like a ELW with a .750 gas block journal instead of .625, not sure if there is any benefit to that, it would have a continuous taper otherwise.

  10. #70
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    Quote Originally Posted by Toyoland66 View Post
    That hodge looks a lot like a ELW with a .750 gas block journal instead of .625, not sure if there is any benefit to that, it would have a continuous taper otherwise.
    Quote Originally Posted by tom12.7 View Post
    The transitions in the barrel exterior profile would ideally be matched to compliment a total defection curve, over a stepped one that adds fulcrum points. Additional points adds in more variables, that is another unknown to try to avoid getting into if we can. Sure, there are some things that we can do to minimize these on the transitions. We can preload a step down within an outer diameter reduction with either preload statically, or a few other things like limiting dynamic movement within the deflecting system. Another argument may be to limit the effect of a reduction in barrel OD by not making that OD as large and reducing the transition.
    The base AR does not barrel whip like a conventional bolt gun. The gas tube exerts a similar force from the pressure to the key as a piston gun, the relative amount is lower with DI as the work is done differently than a normal piston gun, the effects are similar though.
    Ideally, an AR barrel would have a profile that loads the OD reduction transitions with a minimal mass change from the base barrel. No bumps in a mass increase with a proper preload for those that do for a smoother transition down the length of the barrel. Adding in a bump in the barrel defection in the beginning or the end is much easier to deal with than one with bump(s) in the middle.
    Would anyone want to look deeper into these things?
    Not a 12.5" but like this beauty?

    BRT Optimum barrel 16" intermediate gas .625" dia. gas-block journal:



    http://www.blackrivertactical.com/co...ptimum-barrel/

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