Defcon 1 AR-10 Rifle Thread-On Muzzle Brake – 5/8 x 24 .


INSTALLATION GUIDE for the Defcon 1 AR-10 Rifle Thread-On Muzzle Brake - 5/8 x 24 threading GGW Defcon 1 AR-10 Rifle Thread-On Muzzle Brake reduces recoil by a minimum of 60%, eliminates muzzle rise, dust signature and rifle torque. The Defcon 1 is made of the highest quality material and workmanship to deliver high performance and recoil reduction, keeping you on target, while increasing accuracy. Available in 416 Stainless Steel; coated with durable and impact resistant Cerakote paint. Grizzly Gunworks Thread-On Muzzle Brakes are made custom for your AR-10 rifle; according to your specifications, therefore, producing a uniquely designed Muzzle Brake to perfectly fit your firearm. Grizzly Gunworks Thread-On Muzzle Brakes are customizable offering a minimum of seventeen colors and finishes, as well as, colored high strength machine bolts. Quickly and easily install your Thread-On Muzzle Brake with zero gunsmithing or washers required. You are purchasing a Thread-On Muzzle Brake that is made for a threaded barrel. Grizzly Gunworks offers Muzzle Brakes for threaded and non-threaded barrels. BOLTS: Two bolts are INCLUDED with every Thread-On Muzzle Brake purchase. Different colored bolts can be ordered to diversify the look of your Defcon 1 AR-10 Rifle Thread-On Muzzle Brake. Additional bolts are $15.00 U.S. per two bolts.
Colors: Standard two colors and finishes are available at NO extra charge:
  • Armor Black
  • Bead Blast Dull Finish
All other custom colors and bead blast polished finish are an additional coating charge of $70.00 U.S. FD Earth is an extra $15. Bolts: Two high strength machine BLACK or STAINLESS STEEL bolts are included. Polished and Bead Blast finishes come with Stainless Steel bolts. All other muzzle brake colors come with black bolts. Additional bolts can be purchased in different colors for $15.00 U.S. per Two Bolts.


  • Approximate Dimensions:

    Length : 2.55"
    Width: 1.375"
    Thickness: 1.1"
  • Material and Weight:

    416 Stainless Steel: 7.0 oz
  • Threading:

    5/8 x 24
  • Recoil Reduction:

    Minimum 60% for .338
  • Caliber:

    6 mm, .243, 6.5 mm, .257, .260, 6.8 SPC, 7 mm, .270, .300, .308, 7.62, 350 Legend and .338
  • High Strength Machine Bolts:

    Two BLACK or STAINLESS bolts are INCLUDED with every AR-10 Rifle Thread-On Muzzle Brake purchase. Bolts are available in a wide range of colors.
  • AR-10 Models:

    Grizzly Gunworks Thread-On Muzzle Brakes are available for all AR-10 rifles, including and not limited to: ArmaLite AR-10, Aero Precision M5E1, Advanced Armament, DPMS Oracle, LWRC International REPR MK11, Grey Ghost Precision Specter Heavy, Daniel Defence, Brownells BRN-10, Palmetto State Armory AR-10, Bushmaster XM-10, Colt AR-10, Windham Weaponry, Sig Sauer AR-10, Patriot Ordnance, Rock River Arms LAR, Wilson Combat, Heckler & Koch and Ruger SR-762.