I have been searching to no avail about this idea. I have heard people say they "cut the biceps" to improve posing, and this allows weapons to be held more realistically. I get the overall idea, but if anyone has done this successfully, I would much appreciate your advice. Thanks.

Use an exacto to shave the upper arm where it meets the inside of the elbow when u bend the arm. Look where the upper arm meets the lower arm and restricts movement and shave that part away until u get some better movement

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thinktankproduction.com

yeap this works! I just use a regular razor blade.

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Whos Da Masta

http://www.youtube.com/watch?v=jrXSWI0oWHg