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      01-04-2013, 09:28 PM   #5
ybbiz34
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Drives: 2013 C63 AMG Sedan
Join Date: Jul 2007
Location: USA

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First: http://www.f30post.com/forums/showthread.php?t=506177

Second: Pull the charging handle back. As you are pulling the charging handle to the rear (without a magazine in), press the bottom of the bolt release. Voila.

Summary: Lock the bolt open by pulling the charging handle rearward, pressing on the bottom of the bolt catch, and allowing the bolt to move forward until it engages the bolt catch.
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'13 Iridium Silver C63 AMG Sedan (540 hp; 500 lb-ft)