Ok so I bought this http://www.gandrtactical.com/cgi-bin...=action&key=TM but what in the heck is this for? http://www.gandrtactical.com/cgi-bin...ion&key=10566T I will be getting this http://www.gandrtactical.com/cgi-bin...=action&key=3X so will i need that spacer?
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