M4 Carbine Sand Test with FailZero AR-15 Bolt Carrier Group and Hammer Upgrade Kit
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From: defensereview
Added: 16 years ago · 1:13 · 480p
DefenseReview.com (http://www.defensereview.com) contributor Chen Lee a.k.a. "SMGLee" demonstrates the FailZero "AR-15 ...
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