I bought an AR SCR rifle. The end of the barrel is NOT threaded. How do I put a muzzle brake on? Do i have to buy an after market barrel?

3 Answers

  • 5 years ago
    Favorite Answer

    The SCR is not technically an AR (since it is not strictly based on the Armalite design) and was designed for states with laws that prohibit guns based on their scary-looking appearance. In addition, to pistol grips, muzzle devices are also banned in those states, which is why the gun does not have them. If you bought the gun because of state laws, then it is likely you cannot legally have a threaded barrel or install a muzzle device.

    In any case you have three choices for a threaded barrel:

    1) Have a gunsmith thread your current barrel.

    2) Since it appears to use an AR upper, you can most likely buy a new, threaded AR barrel and:

    a. Have a gunsmith install it

    b. Install it yourself with the proper tools.

    3) Buy a different AR upper assembly (you will need to keep the SCR bolt carrier in a new assembly).

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  • C T M
    Lv 7
    5 years ago

    How did you not notice there were no threads on it when you bought it. Take it to a gunsmith and have him thread the barrel for you.

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  • 5 years ago

    It typically costs $100-150 to have a barrel threaded by a smith.

    You can buy a new barrel with threads like this one for $130: http://www.midwayusa.com/product/834998/ar-stoner-...

    Or this chrome lined one (standard for mil-spec ARs) for about $200:


    To install an AR barrel, you need a special wrench (usually $20-30, like this one: http://www.amazon.com/Tapco-Intrafuse-AR-Armorers-... a torque wrench that starts at lower than 40 ft-lbs and goes higher than 70 ft-lbs (usually $40-50, like this one: http://www.amazon.com/TEKTON-24335-2-Inch-Torque-1... an upper action block ($25, like this one: http://www.midwayusa.com/product/210021/wheeler-en... and a bench vise ($50+, like this one: http://www.amazon.com/Wilton-11104-Bench-4-Inch-Op...

    That brings up the cost of a new barrel up substantially, though having a smith install a new barrel typically starts at $75-100, and can go up from there.

    They make adapters to add threads to barrels, but I think they are fairly new and 'unproven'. They aren't sold by major parts carriers and I've never seen a review for one... but they are cheap, at $35, no idea if they work:


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