THE AR10 MATCH RIFLE
A.K.A., AN AR15 ON STEROIDS,
THE MOTHER OF ALL BLACK GUNS



"Shooting an AR-10 is kind of like driving a vintage "muscle car", you don't necessarily need all that power, but it sure is fun to have and drive." - rcw3


The AR-10 is actually the precursor to the present M-16 military rifle developed by E. Stoner. It was tested by the US military in the early '50s, but not adopted for use. Some countries did acquire the AR10B - Sudan and Portugal, but these rifles are rare and parts are hard to find, and not interchangeable with the current incarnation. Recently Armalite/Eagle Arms (and others) began to produce these rifles, and DPMS has evolved a version of it's own (see rifle 006). Rifle 009 has some very unique features and a style that the owner developed, and solved some problems with the the MR conversion in some very unique ways.


THE RIFLES


001



002



003



004



005



006



007



008



NEW!     009     NEW!

CLICK ON RIFLE FOR SPECS


THE CHOICES


THE GUNSMITHS
  • Fred Szablewski
  • George Smith
  • Scott Anzivino
  • John Holliger
  • John Noveske
  • Scott Medesha
  • Derrick Martin
  • THE CALIBERS
  • 6mm-22/250
  • 6.5-08 (260 Rem)
  • 6mm X
  • 6mm XC
  • 7mm-08



  • THE BARRELS
  • Pac-Nor
  • Krieger
  • Border
  • Lilja
  • Hart
  • Douglas
  • Schneider
  • Shilen
  • THE FURNITURE
  • BUTTSTOCKS
    Ironstone
    EGW
    Medesha
  • GRIPS
    Sierra Precision
    Tubb
    Hogue
    Ergo Grips


  • THE TRIGGERS
  • Knight
  • Jewell
  • Rock River
  • Armalite
  • M-K
  • THE SIGHTS
  • Warner
  • PNW
  • GED
  • Redfield
  • Scope



  • THE ISSUES
  • Buffer tube, buttstock - too long a draw or LOP
  • Buffer spring - too stiff
  • Gas hole diameter - how big is too big (or small)
  • Gas hole timing
  • Gas Tube
  • Bolt
  • Magazines - too long for palmrest rule solution, and do they feed?
  • Triggers - Ass'y can't have a wimpy hammer spring
  • Front Sights - which ones are tall enough?
  • Buttstocks - interferes with charging handle?
  • Loads
  • Did I miss any?


  • SOME TIPS AND IDEAS FOUND SO FAR


    Buffer tube, buttstock - too long a draw
    AR-10 buffer tube and buffer with an EGW stock can get you down to 12.75" LOP for offhand. Another solution arose using a CAR tube and shortened buffer so the bolt clears the bolt lock on compression. Check without spring for sufficient clearance to start.

    Buffer spring - too stiff
    If not using an x-08 based case, try using an AR15 buffer spring. Some AR-10'ers have had good results with Tubb's CS AR-15 springs.

    Gas hole diameter - how big is too big (or small)
    Here's some sizes that worked.

  • .243
    4 inches down, .077, AR10 spring, H1000, R-22, IMR&H 4831
    1.8 inches down, .067 to .073, AR10 spring, powders between IMR4350 and H1000

  • 6mm 22/250
    1.8 inches down, .082 - .089, AR15 spring, powders like Varget

    Gas hole timing and barrel length
    One case: "barrel lengths were 26" and 27". Either length worked fine and there was no noticeable velocity difference between the two lengths. We even chrono tested one at 27" then cut it off to 26" and there was no change in velocity - which told us that by the time the bullet got through 26" of barrel, it was going about as fast as it was going to go. The 30" bolt gun barrels we chrono tested were also no faster than the 26" AR-10 barrels. As far as gas port location, we settled on 1.8" further forward from the standard location. We tried 4" further and it worked fine (with a larger barrel port size) but in cold weather, and with some powders, there was some minor vapor condensation noticeable around the gas tube inside the receiver. The condensation did not affect anything but we figured some people might not like the way it looked."

    Gas Tube - fabrication
    Gas tubes have been fabricated from seamless stainless brake line, but these proved to be soft and corrode. Use a gas tube drawn for an AR15 spacegun from another manufacturer (try Krieger). This will put the hole 1.8 inches farther down the pipe. UPDATE: John Holliger (who else?) supplies Krieger with 2" over gas tubes. He informs me that 4" over ones will be available soon, too. Contact him directly at White Oak Precision.

    Bolt - don't use SR25
    Primer piercings were reported by several shooters using SR25 bolts at modest pressures because of poor primer support on ignition. Problem went away with switch to Armalite bolt.

    Magazines - too long for palmrest rule solution
    Fabricate short mag from 10 rounder. Fabricate delrin block SLED.
    Feeding - so far, no feeding problems are reported with unaltered mags in 6-22/250.

    Triggers - Ass'y can't have a wimpy hammer spring
    Can't use some aftermarket AR15 match triggers because of weak primer strikes. The AR10 has a coaxial spring to restrain the FP and prevent slam fires (308 OEM buffer spring is a heavyweight!). Try adapting the OEM hammer spring to work with the aftermarket trigger, and if that works, continue to work from there. Check hammer width as some will not fit through the slot in the bolt carrier.

    Front Sight bases - which ones are tall enough?
    Texas Tallboy (standard Tall Boy too short)
    Sabreco Mfg. Front Sight Base is perfect.

    Buttstocks - interferes with charging handle?
    EGW version allows use
    Medesha version does not - need to fabricate bolt handle for carrier
    Ironstone version - can operate charging handle if cheekpiece is rotated out of the way.

    Loads - remember to work up to these!
  • For 6mm/22-250 at ~2800 fps,
    Pet load - 32 gr Varget, Sierra 107, .005" off lands
  • For 6mm/22-250, 105-107 grain bullet at about 2750-2850 fps:
    IMR 4064 (31-32 grains)
    Reloder 15 (31-32 grains)
    AA2520 (31-32 grains)
    IMR 4895 (30.5-31.5 grains)
    H335 (31-32 grains)
    IMR 4350 too slow

    Contact Info
  • Did I miss anything? Do you want to see your rifle here?  Contact me here.
  • Contact info for 'Smiths (not just George q;-P) and parts:

    Fred Szablewski, Sabreco, (610) 584-8228
    George Smith, EGW, Inc, (215) 348-9892   website   eMail
    John Holliger, White Oak Prec., (309) 376-2056     website   eMail
    Scott Anzivino    eMail
    John Noveske, John Noveske Rifleworks, (541) 479-6117    website   eMail
    Scott Medesha, Medesha Firearms Ltd., (480) 986-5876    website   eMail
    Derrick Martin, Accuracy Speaks, (480) 373-9499    website   eMail



  • HOME | RANGES | MATCHES | INTRO | PHOTOS | PhUn StUpH | MAJOR | FRICKER | LINKS

    email to radomski for submitting info
    Site Meter