Extractor Clearance Gauge Allow for 6 - 8 weeks delivery.
Size: Mil Spec: OD= 1.187-1.186 (Standard military specifications) Competition: OD= 1.185-1.184 (Competition for tight fit uppers, like Aero Precision, RRA, and LMT)
Sizing: Mil Spec: OD= .999-.998 (Standard military specifications)Competition: OD= .998-.997 (Competition for tight fit uppers, like Aero Precision, RRA, and LMT)