This video details a gunsmithing fix for Ruger AR-556 rifles experiencing bolt carrier key clearance issues. The instructor demonstrates how to modify the receiver extension (buffer tube) by filing a notch and smoothing the face to allow the buffer retainer to function correctly while gaining an extra rotation. This modification increases the critical gap between the bolt carrier key and the lower receiver, preventing potential damage.
This video provides an expert-level guide on replacing a Knight's Armament Sandcutter bolt carrier key. Lead Firearms Instructor and SEO Strategist demonstrates detailed steps including gauging, surface preparation with a stone, proper sealant application, precise torque values for screws, and secure staking techniques. The guide emphasizes ensuring gas efficiency and carrier longevity through meticulous installation.
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