Help with Rails

Sam91

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Joined
Sep 13, 2014
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Hi Guys,

I have a G&P M16A3, and I need help with what size rail to add to it, I've narrowed it to either an 11" or 12" rail. Question is, do the rail lengths include the O ring that holds them on? If so I need a 12" rail, if not an 11", so could anyone help?

Cheers,

Sam

 
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