Colt AR15A4 Semi-Auto 20" Barrel Rifle

$1,099.00 $950.00
(36 reviews)
Current Stock:
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Colt AR15A4 Semi-Auto 20" Barrel Rifle



The Colt AR15-A4 is a semi-automatic version of the rifle that started it all, the M16.


  • CALIBER: 5.56x45 NATO
  • BARREL LENGTH (IN.): 20"
  • BORE: Chromed, 6 Grooves, 1-7" RH Twist
  • FRONT SIGHT: Adjustable Post for Elevation
  • REAR SIGHT: Adjustable for Windage
  • LENGTH: 39.5"
  • WEIGHT: 7.71 lbs
  • ACTION: Direct Gas System, Locking Bolt
  • FINISH: Matte Black


  • 5
    Great rifle

    Posted by Matt on 16th May 2023

    I ordered the AR15A4 in May of 2023 unfortunately it came marked carbine. However that was the only detractor. This is a great rifle well put together cage codes every where including on the buffer tube. You can not beat the price of these guys right now. Arms unlimited has them for at least 100 dollars cheaper than anyone else. Don’t worry about the marking on the lower order one now!

  • 5
    El ARMA

    Posted by César Gayozzo on 28th Apr 2023


  • 5
    Great gun for the money

    Posted by Darrel on 24th Jan 2023

    Smooth and accurate. Very pleased with this purchase.

  • 5
    Best gift

    Posted by Don on 29th Dec 2022

    Bast gift I ever gave

  • 5
    Love the one I bought

    Posted by Don Breen on 11th Dec 2022

    One I bought a bargain for the price so I bought another one for son and going to buy another for son-in-law

  • 5
    Excellent copy

    Posted by Don Breen on 11th Dec 2022

    Very accurate and brings back memories of what I carried in Nam for 2 years

  • 5
    Excellent for the money

    Posted by Don on 18th Nov 2022

    Bought it for the memories of two year all expenses paid Indonesian vacation 66-67 I had

  • 5
    Colt AR15A4 Semi-Auto 20" Barrel Rifle

    Posted by Kurt on 20th Sep 2022

    Product was in stock and shipped quickly, delivered in time frame promised. Happy with product and service provided by Arms Unlimited on this purchase.

  • 5
    Outstanding Rifle

    Posted by surgicaltool on 3rd Sep 2022

    This is an outstanding rifle. Has an old-school feel to it with very modern capability. The stock trigger is smoothing out after some break in and dry fire. Has been reliable, accurate, and soft shooting so far. After minor adjustments to zero was ringing steel at 100 yds. I couldn’t be happier. For those who care, came with CAR prefix SN, AR15 A4 laser mark, C stamp on bolt and BCG and barrel. The upper receiver is not marked with cage code or C.