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  • Full Metal Mayhem AR10 Precision Rifle


    Ario™ – Full Metal Mayhem Custom 20″ AR10 Rifle

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    Full Metal Mayhem Ario™ Series, .308 Win Precision AR-10 Rifles.

    Ario is a custom AR10 precision rifle that has been designed and built from the ground up to surpass any expectation you may have for an AR10, SR25 or LR308 rifle. These rifles embody the characteristics of the ancient Ario name — fierce, purity, forceful and displaying a warlike spirit. Starting with an Armalite AR-10®A Series chassis, and using only the highest-quality components, these rifles feature a 20” heavy-profile .308 barrel, an adjustable gas block, High Performance Tubb Precision Flatwire Buffer Spring, 2-stage FCG and much more. These meticulously built firearms are fully tested, accurized and tuned specifically for 7.62 NATO/.308 Winchester. They are perfect for any application, from bench shooting to hunting to showing off. These precision rifles are rugged, precise and absolutely beautiful. The “bleed off” adjustable gas block allows you to tune the rifle for your preferred ammunition and/or suppressor use. The 15″ enclosed handguard features a position-adjustable, direct-attached curved Fore Grip. The 20″ heavy profile,308 barrel has a 1:10 twist and comes with a sub-MOA guarantee*. A lightly padded pistol grip combines comfort with the ideal grip angle for accurate and comfortable operation. The dual-purpose flash hiding compensator tames felt recoil while reducing signature. Available in colors: Metallic Tungsten and in Full Metal Mayhem proprietary metallic colors OD Metal Mayhem and Coyote Metal Mayhem. Ships optics-ready with one 20-round (or 10-round) steel magazine and a hard-shell polymer case. Safely fires .308 Winchester or 7.62 NATO ammunition. Ships pre-tuned for 7.62 NATO (tool and instructions for tuning provided). You can request that your rifle be tuned for 308 prior to shipping by leaving a note with your order.

    *Sub-MOA guarantee is from Ballistic Advantage and any issues with the barrel pertaining to their warrantee must be addressed to Ballistic Advantage.

    Check your local and state laws regarding magazine capacity and detachable magazine compliance before ordering. Not legal for sale in California. You must be 18 or older to purchase.

    Please note: If your local/state laws limit magazine capacity, a 10-round magazine can be substituted. Indicate in comments at checkout.

    Ships FREE to your FFL.

    Additional information

    Weight 13 lbs
    Dimensions 48.5 × 10.5 × 4 in

    Full Metal Mayhem




    Custom AR Rifle


    7.62×51 NATO, 308 WInchester


    10 Round, 20 Round


    Manual Safety


    Two-Stage Precision


    Ballistic Advantage 20" Heavy profile barrel chambered in .308 Winchester
    4150 Chrome Moly Vanadium Barrel, 1:10 twist, QPQ Corrosion Resistant Finish, rifle-length gas
    Adjustable Bleed-Off Gas Block by Superlative Arms
    Ambidextrous Charging Handle
    15" Handguard
    Compensator/Muzzle Brake Combo w/large dual chamber and angled gas ports
    Foregrip adjustable position (set screws)
    Fixed Rifle stock with adjustable Cheek Rest and Butt Pad (length-of-pull adjustment = 1")
    Accurized: upper receiver squared to barrel, barrel shimmed in place eliminating barrel movement
    Premium flat-wire buffer spring from David Tubb
    Fully tuned for 7.62 NATO (Will cycle with .308 but with higher felt recoil. When adjusted for .308, 7.62 NATO will not cycle)


    Forged 7075-T6 Aluminum, Cerakote finish
    4150 Chrome Moly Vanadium, Black finish
    Polymer, Black finish


    Weight: 10 lbs.
    Overall Length: 42.25" – 43.25"
    LOP: 14.625" – 15.625"
    Overall Height: 7.5"
    Overall Width: 2.625"


    20*-Round Steel Magazine, 1 each
    Tools, Instructions
    Hard Case, polymer
    *Optional 10-round steel magazine available


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