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Thread: barrel thickness

  1. #11
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    I think to a degree it depends on how light the profile. Doesn't the SR-15 have a LW profile barrel?

  2. #12
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    Quote Originally Posted by Mr. Goodtimes View Post
    I think to a degree it depends on how light the profile. Doesn't the SR-15 have a LW profile barrel?
    I've not mic'd one, but to my eye, next to my DD LW, the SR-15 is a little thicker, so I'd call it a mid-profile.

    In regards to the OP's question: I think people get way too wrapped around the axle about accuracy in a fighting rifle; I know, I used to be one of them. Here's what happens, we start to look at purchasing components or complete rifles, and we want the best. Buy once, cry once, right? Anyway, we dig into the specs and before you know it, we've got the mostest awesomest baddest assest rifle ever. Then, we put a sight on it that limits our potential accuracy purely based opon repeatable sight picture to 2MOA @ the least (usually 4 MOA). Then, unless all your shooting happens off the bench (and if this is the case, build a freakin' bench gun, not a RDS'd AR) you pick the gun up and shoot it, often while moving, seeking cover/concealment, different positions, etc...and we haven't even talked about what ammo you're running.
    Now, I'm not saying to throw accuracy out the window, but it certainly should not rank #1 in terms of requirements for a fighting-type carbine. If your requirements are for continuous full-auto fire, buy a freakin' belt fed. Otherwise, a lightweight barreled AR will do everything you need it to and much more comfortably than other barrel profiles. FWIW, once I established my zero at my recent Vickers class I put roughly 400 rnds through my LW DD barrel and every target on every drill was clean. This was 4-10 shot groups per drill @ ranges from 7 to 25yds, off-hand, moving, against a timer, iron sights only. The black zone was 8". Is that super-precision? No. Did other people with magnified optics and heavier-profiled barrels drop more shots than I did? You bet.
    To clarify, this is not to brag about my shooting ability, because an 8" group isn't really much to brag about, but rather to make the point that the benefits of the LW barrel far outweigh any drawbacks (and I don't really see any based on my needs/use of a carbine.)
    Semper Paratus Certified AR15 Armorer

  3. #13
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    Didn't Molon do some accuracy testing of different barrel profiles against one another? I can't find it now but if he hasn't he should.
    Shooting 30 round groups, the lightweight barrel was larger than both the goverment and HBAR.

    I also think its worth saying the Noveske NST barrels are lightweight for a SS barrel. They are the same weight as a goverment profile barrel.

    https://www.m4carbine.net/showthread.php?t=72761

    Quote Originally Posted by Molon View Post
    The pic below shows the results of firing three 10-shot groups in a row from each of the displayed barrels in a semi-automatic AR-15, from a bench-rest at 100 yards using match-grade hand-loads.



    Colt 16” light-weight (pencil) profile, 6520 – 1 pound, 6 ounces







    Colt 16” M4 (government profile), 6920 – 1 pound, 12 ounces.










    Colt 16” HBAR, 6721 – 2 pounds, 3 ounces.













    ….
    Before you buy a "fighting rifle" really evaulate if you're going to be fighting with it, humping it in a class, carrying it long distances etc etc. If you want to shoot one ragged hole at 100 yards, then buy accordingly.
    Last edited by bp7178; 03-11-11 at 14:50.

  4. #14
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    NOT POSSIBLE!!! That 6721 is 1/9!!!

    Sorry... I just had to.

  5. #15
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    Quote Originally Posted by ASH556 View Post
    <snip>
    If your requirements are for continuous full-auto fire, buy a freakin' belt fed. Otherwise, a lightweight barreled AR will do everything you need it to and much more comfortably than other barrel profiles.
    <snip>
    Suitability to adapt to different roles without adopting entirely different equipment (and their supply chains) is advantageous in itself.

    Saying it will do everything you 'need' it to is a bit general. Lightweight has a place, as does an HBAR/Gov't/Taper. Everything is a compromise, whether or not it's a compromise that's advantageous depends entirely on circumstance, application, and the person.

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