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Old January 24th, 2009, 15:46   #3
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Join Date: Dec 2005
Location: Scarborough, ON
This one is for the M16A2:


and this one is for the SR-16/M4:


It looks like they're both wired for the rear, but the one for the SR-16/M4 has a hole in the cylinder for inner barrel length differences.
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