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Adjustable Gas Blocks Are Awesome

I’m a little embarrassed to admit this, but I never gave an adjustable gas block on an AR-15 much thought until I was forced to use one recently while evaluating an ArmaLite M-15 VSR Versatile Sporting Rifle. I’m not talking about the three-position blocks like on a Ruger. I’m talking about the ones that you fully close and then slowly …