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Old October 22nd, 2007, 03:35   #2
ILLusion
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Join Date: Jun 2002
Location: Toronto
It's made to mount on to any standard 20mm / Weaver rail.

To answer your question:
The classic M4 Carbine that you have linked does not have a rail at the bottom, and as a result, can not support that vertical grip.

You'll have to add a rail system to the gun to attach a vertical grip. I've seen lots of hackjobs on this, but the fact remains: the grip panels of the carbine aren't meant to handle that type of stressload and is very wobbly. I wouldn't recommend it. Get a rail system.
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