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Thread: 12.5 vs. 14.5

  1. #11
    Join Date
    Dec 2007
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    My recommendation for the OP would be the 12.5" gun. I don't see much of a point in SBR'ing a lower for a 14.5" gun. If you want to build a 14.5" after you have your lower registered, then rock on. But for the first SBR, my vote goes with a 12.5" barrel.

    I currently run the following set:
    • 12.5" Centurion Arms CHF barrel (standard gas block)
    • Surefire MB556 brake
    • KAC URX4 10.75" rail
    • VLTOR A5 buffer system (A5H4 buffer+BCM rifle spring)

    This is, by far, the smoothest shooting rifle I own. Recoil is very mild (.22LR-like) and the muzzle stays very flat during rapid fire. I have run this gun with a Mk262 clone load out to 400 yards and have made hits on 12" plates pretty easily with a 1-7x optic (also got one lucky first-round hit on a 6" plate at the same distance). Have run it on a full-auto lower for a some mag dumps and have run it in a couple of 2-gun matches and 3 carbine courses. It's also one of the most accurate guns I own. I benched it after about 3500 rounds (not so gentle firing schedule) and it will still print just above 0.75 MOA with match ammo.

    The gas port in my barrel was a little smaller than I expected (.065" when new) but it has cycled both 5.56 and .223 pressure ammo with this setup. If MN legislature changes the suppressor laws this year, I'll run either a Saker or SpecWar 556 K can on this gun pretty often. If the additional pressure becomes an issue for me, I'm conisder one of the Baby Govnah gas blocks from Micro MOA that allows you to drill your own gas port size in the gas block.

    Hope that helps.

  2. #12
    Join Date
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    Agreeing with the above. My 14.5" w/ Surefire brake installed is 16.5" OAL anyways, so why bother with a stamp for it?

  3. #13
    Join Date
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    Quote Originally Posted by docsherm View Post
    I feel that the 12.5 5.56 AR is the best all around system. I like 14.5 barrels but to choose I will go 12.5 any day. 12.5 is the shortest barrel that you can go and still get proper stabilizing of the heavy 5.56 rounds. I have had no issues with a 12.5 out to 400 plus meters with MK262.
    Is this true? What is the max bullet weight that could be stabilized by an 11.5" 1:7 twist barrel?

  4. #14
    Join Date
    Oct 2012
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    If both of them isn't an option, go with the 12.5. The extra rail space is a non-issue for me, because I don't reach out that far anyway. Use a quality barrel, and the 2" won't make a difference out to 400 yards. This is pretty close to NickB's setup, with 2 more inches of barrel and a FH on the Saker K.

    To educate a man in mind and not in morals is to educate a menace to society. --Theodore Roosevelt--

  5. #15
    Join Date
    Nov 2006
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    Quote Originally Posted by Benito View Post
    Is this true? What is the max bullet weight that could be stabilized by an 11.5" 1:7 twist barrel?
    I haven't had any issues stabilizing 77gr Mk262 out of 10.3"-10.5" guns with a 1:7 twist rate, and I've seen even heavier rounds fired with good results.
    --Nick
    Owner, Reptilia & Side Project, LLC

  6. #16
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    Nick

    is there a direct thread mount for the Omega for the 1/2x28 5.56/223 thread?

    I'm considering direct mounting an omega on this gun. you think that is better than a specwar K?

  7. #17
    Join Date
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    Quote Originally Posted by bates View Post
    Nick

    is there a direct thread mount for the Omega for the 1/2x28 5.56/223 thread?

    I'm considering direct mounting an omega on this gun. you think that is better than a specwar K?
    Yep, you can get a direct thread and a flat front cap to make it even shorter/lighter. I really like the Omega since it's so damn light, but the Specwar-K is more durable for lots of full auto fire or super high round counts. Everything has a 100% lifetime warranty, though, so you won't go wrong either way.
    --Nick
    Owner, Reptilia & Side Project, LLC

  8. #18
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    I was surprised at how short / light the Omega is with direct thread and flat end caps. And it is stupid light!

  9. #19
    Join Date
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    Quote Originally Posted by NickB View Post
    Yep, you can get a direct thread and a flat front cap to make it even shorter/lighter. I really like the Omega since it's so damn light, but the Specwar-K is more durable for lots of full auto fire or super high round counts. Everything has a 100% lifetime warranty, though, so you won't go wrong either way.
    Are can rebuilds from heavy use part of the warrenty? If so that is crazy. Regardless, my 11.5 is getting a brake for the Omega.

  10. #20
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    Quote Originally Posted by foxtrotx1 View Post
    Are can rebuilds from heavy use part of the warrenty? If so that is crazy. Regardless, my 11.5 is getting a brake for the Omega.
    Yes, rebuilds are covered. It's extremely rare to have someone actually shoot out a suppressor, and if they do, we want to see it for R&D purposes.
    --Nick
    Owner, Reptilia & Side Project, LLC

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