Page 1 of 5 123 ... LastLast
Results 1 to 15 of 75
  1. #1
    Join Date
    Dec 2012
    Location
    TN
    Posts
    7,592
    Downloads
    10
    Uploads
    4

    11.5" Carbine Barrels

    I've noticed that some companies have quit making 11.5" carbine barrels while others don't make carbine barrels shorter than 11.5". A local Gunsmith advised that my new upper that I'm building be a 11.5" rather than a 10.5" due to reliability. Do 10.5" barreled uppers have that much of issue with reliability? I have been considering using a 11.5" barrel with an 10.75" URX 3.1.

  2. #2
    Join Date
    Jun 2010
    Posts
    497
    Downloads
    0
    Uploads
    0
    Dwell time is an important consideration in having a reliable gas system. An 11.5 with carbine length gas system has a 40% longer dwell time than a 10.5 according to Paul Buffoni at BCM. I have a couple of BCM BFH barrels in 11.5. They have .073 gas ports and Bravo Company recommends an H buffer, but they cycle most lots of PMC Bronze just fine with an H2 buffer and full-auto BCG.
    Last edited by Hmac; 13 April 2014 at 14:35.

  3. #3
    Join Date
    Oct 2012
    Posts
    396
    Downloads
    0
    Uploads
    0
    Dwell time? Is that how long the gas is in the gas tube? Sorry for the newbie question. Still learning here.

  4. #4
    Join Date
    Dec 2012
    Location
    TN
    Posts
    7,592
    Downloads
    10
    Uploads
    4
    Thanks HMAC this is my first venture with a SBR.

  5. #5
    Join Date
    Jun 2010
    Posts
    497
    Downloads
    0
    Uploads
    0
    I have no experience with 10.5s, but can attest that my 11.5 inch barrels run very well. I should specify that I don't run a suppressor on any rifle. That makes a difference as it changes the pressure profile.

  6. #6
    Join Date
    Jul 2013
    Posts
    845
    Downloads
    0
    Uploads
    0
    10.5s are perfectly fine and have been ran in special units for quite a few years.....no problems with my DI 10.5 or. 7.5 piston.....having the right size gas port is essential though.

  7. #7
    Join Date
    Jun 2010
    Posts
    497
    Downloads
    0
    Uploads
    0
    Quote Originally Posted by tact View Post
    10.5s are perfectly fine and have been ran in special units for quite a few years.....no problems with my DI 10.5 or. 7.5 piston.....having the right size gas port is essential though.
    Yup. No doubt. I'd have no worries running a 10.5 built by a reputable firearms mfgr or skilled armorer. Noveske makes a 10.5 that is tuned to perfection, I hear. The OP is building his SBR. What size gas port should he be drilling in his 10.5?

  8. #8
    Join Date
    Dec 2012
    Location
    TN
    Posts
    7,592
    Downloads
    10
    Uploads
    4
    It's between a 10.5" and a 11.5". If I do a 10.5" the barrel will be a Noveske. I haven't decided on a barrel if I were to do a 11.5".

  9. #9
    Join Date
    Dec 2009
    Location
    Colorado
    Posts
    1,104
    Downloads
    0
    Uploads
    0
    Keep in mind there is a shit-ton of blast (technical term) from a 10.5" barrel. The manual for my Gemtech 5.56 suppressor says the warranty is borked if used on a barrel less than 12". Just something to consider.

  10. #10
    Join Date
    Dec 2012
    Location
    TN
    Posts
    7,592
    Downloads
    10
    Uploads
    4
    Is the blast much different between a 10.5" and a 11.5"?

  11. #11
    Join Date
    Apr 2012
    Location
    N. KY
    Posts
    3,056
    Downloads
    1
    Uploads
    0
    Quote Originally Posted by MoxyDave View Post
    Keep in mind there is a shit-ton of blast (technical term) from a 10.5" barrel. The manual for my Gemtech 5.56 suppressor says the warranty is borked if used on a barrel less than 12". Just something to consider.
    Ha..Ha...ha.. MD, I experienced this about two weeks ago. Me and a bud went to the range and took several rifles with us. I shot his SBR piston pistol, and not only did I have a hell of a time controlling it, rapid fire, but the muzzle blast was something to behold. Something I was fairly familiar with from my days of handgun hunting, and working up loads at the bench, but this one caught me off guard. Now I know the proper unit of measure for this is "Shit-tons".

    FT
    NRA Life Member
    Deplorables Life Member
    Bible and Gun Clinger
    Filthy Stinking Wal Mart Shopper


  12. #12
    Join Date
    Jun 2010
    Posts
    497
    Downloads
    0
    Uploads
    0
    Quote Originally Posted by GOST View Post
    Is the blast much different between a 10.5" and a 11.5"?
    Can't compare, but the blast from my 11.5 is greater than my 16 inch (SBR also has a BattleComp muzzle device). Not overly so...I notice it mostly shooting it indoors. Completely manageable, but noticeable.

    In this video, the first rifle being shot is my 11.5 with BattleComp. https://www.youtube.com/watch?v=vtpGrPpxIEA Watch it and draw your own conclusions.

  13. #13
    Join Date
    Jul 2013
    Posts
    845
    Downloads
    0
    Uploads
    0
    Quote Originally Posted by MoxyDave View Post
    Keep in mind there is a shit-ton of blast (technical term) from a 10.5" barrel. The manual for my Gemtech 5.56 suppressor says the warranty is borked if used on a barrel less than 12". Just something to consider.
    There are better suppressors that will handle a 7" barrel just fine.

  14. #14
    Join Date
    Oct 2012
    Posts
    396
    Downloads
    0
    Uploads
    0
    Quote Originally Posted by tact View Post
    There are better suppressors that will handle a 7" barrel just fine.
    Which ones? And will the warranty cover it?

  15. #15
    Join Date
    Jul 2013
    Posts
    845
    Downloads
    0
    Uploads
    0
    Quote Originally Posted by KevinBL View Post
    Which ones? And will the warranty cover it?
    Yes I have the email with direct response from Silencerco rep on Saker series. They use a material 30% stronger than the regular Inconel.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •