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Inside the Mechbox: A&K airsoft M4 D1 Internal Upgrade Pt.2

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Uploaded on Apr 22, 2011

ASTKilo23 along with AirSplat present the first in a series of internal Upgrades for the A&K M4 D1 AEG rifle. This outstanding airsoft cqb rifle presents a solid base to upgrade or modify. In the second video he installs Kanzen ball bearing bushings and explains the benefits of bearing bushings vs standard solid piece bushings.

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