Sushicake is right. If your gun is built like other VFC m4, then the screw in the buffer tube doesn't screw into the gearbox but the lower receiver. If this is the case, you should be able to take off the grip, body pins (don't forget the one above the trigger), bolt catch and mag release to remove the gearbox. Also, the rear body pin might be a bit long so it won't clear the gearbox for you to remove it. Pop off the retaining clip on the body pin and remove the body pin completely off. Then the gearbox should come out easily.
Last edited by HKGhost; May 26th, 2011 at 01:09..
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