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AR15.COM
4/7/2003 4:33:59 PM EDT
Hello,  I am a Bushmaster guy so I need some help.  My friend has a pre-ban Colt 7.62x39 with a screw instead of the front pin.  He wants a second upper in .223.  Are all Colt lowers with a front screw large pin ar small?  Can this screw be replaced with a pin?  Thanks, Ed