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SBR 10.5, 11.5, or 12.5?

Discussion in 'Black Rifle Forum' started by brausso, Feb 27, 2013.


  1. brausso

    brausso
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    Just picked up an LMT lower today and am sending in my form 1 for my stamp. This is my first go at an SBR. This rifle would be used strictly for range (200 yards or less) and home defense. I have AR's in 16 and 14.5 (pinned) currently.

    I am leaning towards the 10.5 simply because if I'm going to go short, I want to go short. I like this length for cqb.

    What do you recommend and why?
     

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  2. DrtyHarry

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    What caliber?



    DH
     

  3. brausso

    brausso
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    223/556
     
  4. DrtyHarry

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    Do you plan on suppressing it? I asked the same question a while back when looking into a SBR and this is the best answer I got.

    If you are really going to do it, the 12.5" is probably the best compromise in terms of reliability, handy size, and decent velocity. It can be had in piston or DI. Another poster said you don't gain anything from a piston...not true. The pistons actually shine in an SBR more so than in a full size configuration.

    There are always trade-offs. Are you going to suppress the gun? Important question. The piston will definitely make life easier if going suppressed either way. Downside- pistons tend to have a bit more recoil.



    DH
     
  5. AK_Stick

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    Personally, with a 5.56, I'd never go back to a 10.5


    If I ever buy another SBR, it'll be a 11.5 or 12.5.


    Short is cool, but you just give up too much range and performance with the 7.5-10.5 inch tubes.

    Now a 6.8, or 300 BLK I'd go to 10.5 in a heartbeat.
     
  6. MrMurphy

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    What stick said.

    Anything under 12" in a AR tends to get a little funky for truly reliable performance.

    I've got enough time on a variety of SBRs with free ammo to know i'll personally never go under 12" unless it was issued.
     
  7. KalashniKEV

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    12.5" gives you the best feel, best reliability, and good velocity.

    [​IMG]

    10.3/5" and 11.5" I can barely feel the difference without looking at the barrel- and the jump in reliability between 10.5" and 11.5" is real.
     
  8. kingdong

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    12.5 any day. Shoot them lots and you'll see.

    Sent from my SAMSUNG-SGH-I317 using Tapatalk 2
     
  9. utah

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    Have an M16 with 10.5 223 and 9mm upper and neither has failed to run at anytime...Beta mag dumps included. My opinion...go 10.5".
     
  10. Keyhole

    Keyhole
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    My thoughts exactly. I just switched from a 7 to a 12.
     
  11. Travclem

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    I prefer 10.5" especially since you already have a 16" and a 14.5" carbine. The 12" is a good all around length but since this is a purpose built cqb gun, go short. A 10.5" rifle with most suppressors is the same length as a 16" carbine. Buy a quality upper like LMT or BCM and you should have no reliability issues.

    LMT factory 10.5" SBR
    [​IMG]

    ETA: I've only put 1,200 rounds through this rifle, but I have had 0 failures.
     
    #11 Travclem, Feb 27, 2013
    Last edited: Feb 28, 2013
  12. txleapd

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    Hook 'Em Up

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    I have an LMT 10.5 also. It's my work gun that I use for warrant services, building searches, room clearing, etc...

    I went with a 10.5 specifically because it is mainly for CQB type stuff. Before this rifle I used an issued 14.5 rifle, and the difference is huge. All of our SWAT entry guys are running 10.5 rifles too.

    My advice is this.... If you are looking for a CQB gun, get a CQB gun. If you were wanting an all around type rifle, I would agree with going 12-12.5, but you're talking CQB. Use the right tool for the job. You wouldn't want to use a screwdriver if you need a hammer. It can be done, but not nearly as well.

    As far as reliability goes, a quality gun (built that way from the get go) will run.

    Since you're talking CQB, the barrel length won't effect ballistics enough to matter at the distances you intend to use it. I hope you don't plan on 200+ yards shots in CQB. You've got other rifles for that.

    M2CW




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  13. Big Bird

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    I have a 10.5" LMT upper SBR. I have no issues. When I first got it it short stroked. Called LMT and turns out I was using a H2 buffer and they recommend a Standard Carbine Buffer with their upper. Made the switch to the Std buffer and its been flawless over 1,000 rounds since.

    You won't have issues with ammunition terminal performance inside of about 120 yards with an SBR. Beyond 175 yards all guns--even a 20" rifle drops below the velocity required for M193 or M855 to fragment in tissue. Other ammunition may do better.
     
  14. Mayhem like Me

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    My 10.5 piston runs 100% so does my DI Colt. Build what you want .

    10.5 is a great size for a dedicated entry gun. I like 12.5 as a patrol rifle since it gives a little more range and is managable in CQB.
     
  15. WoodenPlank

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    Who?

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    I have a 10.5", and I have been very happy with it. My LMT upper is easily minute-of-man accurate at 300 yards (even with crappy ammo and nothing more than an Aimpoint), and has been boringly reliable with a BCM bolt group and H2 buffer.

    If I had to do it all over again, though, I probably would have gone with 11.5" (Factory Colt Commando) for the slight increase in velocity and better reliability.
     
  16. mjkeat

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    I've only ran a couple SBRs and the 12.5" versions seemed to work more reliably.
     
  17. Cole125

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    If you going to all the trouble to get a SBR, get the 10.5!
     
  18. Clusterfrack

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    Like Woodenplank, my LMT Mk18 10.5" has been 100% reliable, both suppressed and unsuppressed. I've done just fine at 300 yards with it too.
    [​IMG]
     
  19. AK_Stick

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    I never had any issues reliability wise with my rifles.


    I simply wanted the increased velocity and energy of the longer barrel. (And since I can take my upper to work with me, possible real life usage weighed in)
     
  20. txleapd

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    Hook 'Em Up

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    If I were king, all of our patrol rifles would have 12.5 barrels.



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