Inside the Mechbox: A&K airsoft M4 D1 Internal Upgrade Pt.1

  • 13 years ago
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 this first video he uses a high torque motor, along with an m100 spring to increase the rate of fire and trigger response time

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