Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 25

Thread: Info on ARPerformance 16" LW middy

  1. #11
    Join Date
    Nov 2010
    Location
    MI
    Posts
    3,055
    Feedback Score
    21 (100%)
    All things being equal, a longer barrel uses a smaller port.

    Quote Originally Posted by dkindig View Post
    I was going to say something about this earlier and I wish I had.

    There has been an ongoing discussion on 68forums about port sizes and Clint's data matches that. I'm running an older ARP 18" 6.8 middy barrel and the port on that is .086. Harrison normally runs a .082 port on those barrels but mine was made around the time that he was trying to make them run reliably with Remington UMC SAAMI ammo so he wanted more gas for the weaker rounds.

    The only flaw I can think of with that theory is that (and I'm not sure about this) with the increased dwell time of an 18" barrrel over a 16" barrel, you would think that the port would be slightly larger for a 16" barrel. I could be over-thinking the whole thing though...
    Last edited by Clint; 08-20-13 at 11:04.
    Black River Tactical
    BRT OPTIMUM HFCL Barrels - Hammer Forged Chrome Lined 11.5", 12.5", 14.5"
    BRT OPTIMUM Barrels - 16" MPR, 14.5" MPC, 12.5" MRC, 11.5" CQB, 9" PDW
    BRT EZTUNE Preset Gas Tubes - CAR and MID
    BRT Covert Comps 7.62, 5.56, 6X, 9mm
    BRT MarkBlue Gas Tubes - BRT EXT, EXC and PDW Lengths
    BRT MicroPin Gas Blocks - .750" & .625"
    BRT MicroTUNE Adjustable Gas Blocks
    BRT CustomTUNE Gas Ports

  2. #12
    Join Date
    Sep 2012
    Location
    Austin, TX
    Posts
    315
    Feedback Score
    2 (100%)
    My socom profile ARPerformance barrel runs great. Shoots sub moa with pmc 54gr junk ammo. Ive been very happy with it and an H2 buffer.

  3. #13
    Join Date
    Apr 2012
    Location
    Texas
    Posts
    1,347
    Feedback Score
    33 (100%)
    I was specific on asking about a 5.56, but could have been quoted the port size for a 6.8.
    Never even thought about that.
    Great catch.
    POW-MIA, #22untilnone
    Let Us #NeverForget!


    If I agreed with you, we'd both be wrong.

    The last thing I want to do is hurt you,
    but it's still on my list.

  4. #14
    Join Date
    Jan 2008
    Location
    Roaming
    Posts
    683
    Feedback Score
    0
    If you port barrels to run with true m193 and everyone uses cheap ammo how many call backs do you get and how many shipping charges do you eat?
    The OP asked about shooting steel case Tula, it takes a .082 just like it does to run American Eagle and Remington UMC.
    As a manufacturer I think it's better to port the barrels to run what works with a wider range of ammo and what most shoot not just the upper end and everything else short strokes.
    How many times have you been to the range and hear someone say "this POS wont cycle"...and most are using the cheapest ammo they can find at Wally World. That same crowd wouldn't notice the m193 cases landing forward of 3 O'clock.
    The high speed low drag crowd runs H2 buffers and heavy springs anyway. m193 drops right around 3-3:30 setup that way.
    OP, what I told you is how we port the barrels. If you use cheap steel case they will run fine, if you use m193then you may need a H2 buffer to slow things down. As far as the accuracy thing, I'm just truthful. Some guys will buy a $200 lightweight barrel and then say "this thing wont shoot 3/4" with the cheapest ammo made, what's wrong with this thing".
    Shoot 69 or 77gr SMKs with 24gr Re15 off a bench with a good trigger and scope and shooting skills and they'll shoot under an inch.
    I have no idea how they will shoot with Tula off the tailgate of a truck using a $28 red dot from Walmart.
    Last edited by constructor; 08-23-13 at 13:30. Reason: sticky keys
    AR15performance
    TRUMP 2020
    The 6.8 is the best choice for hunting deer and hogs with an AR15.

  5. #15
    Join Date
    Dec 2009
    Location
    I go where I'm told.
    Posts
    2,167
    Feedback Score
    15 (100%)
    From the horse's mouth. Overall, good info, here.
    Quote Originally Posted by constructor View Post
    If you port barrels to run with true m193 and everyone uses cheap ammo how many call backs do you get and how many shipping charges do you eat?
    The OP asked about shooting steel case Tula, it takes a .082 just like it does to run American Eagle and Remington UMC.
    As a manufacturer I think it's better to port the barrels to run what works with a wider range of ammo and what most shoot not just the upper end and everything else short strokes.
    How many times have you been to the range and hear someone say "this POS wont cycle"...and most are using the cheapest ammo they can find at Wally World. That same crowd wouldn't notice the m193 cases landing forward of 3 O'clock.
    The high speed low drag crowd runs H2 buffers and heavy springs anyway. m193 drops right around 3-3:30 setup that way.
    OP, what I told you is how we port the barrels. If you use cheap steel core they will run fine, if you use m193then you may need a H2 buffer to slow things down. As far as the accuracy thing, I'm just truthful. Some guys will buy a $200 lightweight barrel and then say "this thing wont shoot 3/4" with the cheapest ammo made, what wrong with this thing".
    Shoot 69 or 77gr SMKs with 24gr Re15 off a bench with a good trigger and scope and shooting skills and they'll shoot under an inch.
    I have no idea how they will shoot with Tula off the tailgate of a truck using a $28 redot from Wamart.
    Acta Non Verba

  6. #16
    Join Date
    Feb 2011
    Location
    Central Texas
    Posts
    300
    Feedback Score
    0
    Quote Originally Posted by constructor View Post
    Shoot 69 or 77gr SMKs with 24gr Re15 off a bench with a good trigger and scope and shooting skills and they'll shoot under an inch.
    I have no idea how they will shoot with Tula off the tailgate of a truck using a $28 red dot from Walmart.
    I owned an ARPerformance upper in 6.8SPC (a mid-length SOCOM barrel), and with factory ammo (Barret 6.8), the thing was a tack driver: sub-MOA as long as I did my part, and sometimes even when I didn't do my part.

    When I buy from Harrison, I buy with confidence and without hesitation.

  7. #17
    Join Date
    Apr 2012
    Location
    Texas
    Posts
    1,347
    Feedback Score
    33 (100%)
    He answered my question and confirmed it before the masses.
    Most of my ammo is brass cased M193 and Amer Eagle A223, but I do have a good bit of Tula and Silver Bear left over when this upper wore a Spike's Tactical 5.56 chamber CL barrel. I purchased this barrel after reading and others personal experience with ARP products. Not being a precision shooter with my AR, I would not expect TULA to shoot like match ammo.
    Come on Fall so I can enjoy shooting more.
    RDS is a Aimpoint H-1 2MOA on a Seekins fixed mount.



    Last edited by RWH24; 08-23-13 at 14:08. Reason: added another picture
    POW-MIA, #22untilnone
    Let Us #NeverForget!


    If I agreed with you, we'd both be wrong.

    The last thing I want to do is hurt you,
    but it's still on my list.

  8. #18
    Join Date
    Feb 2011
    Location
    Central Texas
    Posts
    300
    Feedback Score
    0
    in any case, that's a good lookin stick!

    I like the simple builds that can deliver.

  9. #19
    Join Date
    Mar 2013
    Location
    Florida
    Posts
    219
    Feedback Score
    8 (100%)
    I was thinking about using one of their 6.8 barrels on a new build.I know they have a pretty good rep with that crowd

  10. #20
    Join Date
    Oct 2012
    Posts
    615
    Feedback Score
    15 (100%)
    Quote Originally Posted by 03scgt View Post
    I was thinking about using one of their 6.8 barrels on a new build.I know they have a pretty good rep with that crowd
    Just sighted in my rifle with 16" scout barrel and five shot groups were right at 1" with factory SSA 110gr accubonds. Haven't had the change to roll some of my own loads but when I do I'm positive the group will shrink up. For the price, Harrison's barrels can not be beat.

Page 2 of 3 FirstFirst 123 LastLast

Bookmarks

Posting Permissions

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