The AR 15 and AR 10 use a "Gas Impingement" system to enable cycling of weapon. We have found that MOST Barrel Manufactures oversize the Barrel Gas Ports, this ensures complete cycling of the weapon. This simply put, over-gases the weapon which creates additional recoil, muzzle rise and shortens the service life of the weapon. We are now supplying Adjustable Gas Blocks on most of our AR 15 and ALL AR 10 Platforms.
An adjustable gas block is a simple device and at its core, it’s designed to allow the operator to control the amount of gas that flows into the gun. Typically you rotate a small screw and the amount of gas that can pass through the weapon is either increased or decreased. The hidden benefits of an Adjustable Gas Block are Less Recoil, Reduced Muzzle Rise and Longer Service Life of the Weapon.
Once you install your parts its time to hit the range and start the tuning process. You need to tune the rifle to the rounds you are going to use. Load several magazines with a single round.
Set the gas block to the most closed setting. Rack the weapon and fire. 99.99% of the time the gun will not cycle properly, that is to be expected. Now adjust the gas block one rotation, and fire again. It likely won’t cycle, and that’s okay. Repeat this process until the weapon cycles, and the bolt locks rearward on an empty magazine. Once the bolt locks to the rear of the rifle go ahead and give the adjustment screw on the gas block an extra ½ rotation. This final rotation is a just for reliability purposes. You want a little extra gas, to ensure the weapon is working after a few hundred rounds. At this point the ejected brass should be thrown between 2 to 5 O'clock.
Once you have the gun cycling reliably smile and enjoy that reduced recoil and muzzle rise
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