Quality AR 15 uppers, AR15 parts, AR-15 rifle manufacturer. Friday Harbor, WA
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16" 5.56 1/9 M4 15" Slimline M-Lok Rail w/BCG + CH
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Original Price $429.99
Your Price $349.99
This product is not available for purchase.
Whether you're headed to the range or a 3-Gun competition we have put together a package that will perform with the top of the field. Built on a 4150CMV nitrogen stress relieved barrel, machined in house, to deliver the accuracy you demand. Complete with a bolt carrier group, charging handle and one of our new 15" free float Slimline M-Lok  rails this upper is lightweight, accurate and reliable.

AR-15 Complete Upper Assembly:

    Hardened Arms M4 Feed Ramp Flat Top Receiver
    Black anodized mil-spec finished upper receiver
    Feed ramps for increased feeding reliability on barrel and upper
    Laser etched T-Marked upper receiver
    5.56mm 4150CMV Nitrogen Stress Relieved Hardened Arms Barrel
    M4 profile Barrel with 1/9 Twist
    Chambered in 5.56 NATO (will also fire .223 ammo)
    16" barrel with M4 Extension
    .750" diameter at gas block
    1/2x28 threaded muzzle/barrel
    Low profile gas block
    Barrel dimpled to secure gas block
    Carbine length gas system
    A2 flash hider
   15" Slimline M-Lok Rail



Fits any mil-spec AR15 lower receiver.


Hardened Arms uppers are high end, accurate, head spaced, inspected and test fired prior to shipping. They are built using stringent specs, top quality parts and procedures to ensure maximum reliability and performance.

You are responsible for knowing your state laws regarding barrel lengths, pistol and short barreled rifle restrictions. A 20% restocking fee will apply if you cancel any time after you order or if you cannot take delivery due to state restriction. Dealer programs are available on our website. Two year warranty against manufacturer defects. Finishes will wear with use, no warranties apply to finish wear.
515 Tucker Ave, Friday Harbor, WA 98250 | sales@hardenedarms.com
Phone: 425-530-0837