Real Avid Lug-lok Upper Vise - Block For Ar15's

FEATURES:
-Fits .223/5.56 AR15s
-Vise Pin Retaining Holes
-Lock Knob Retaining Holes
-Aircraft Grade Aluminum
-Star Chamber Locking Lugs
-Upper Receiver Lock Knob
-Alignment Flange
-2 Stainless steel vise pins