Description
Sig Optics Whiskey4 3 12x44mm 30mm Sf Sfp Quad Plex Black Backpack Straps Continual diagnostics check for proper Continual diagnostics check for proper connection The XS AR Upper & Lower Receiver Block is designed to allow the user to hold an AR 15 M4" AR 10" or SR 25 receiver in a bench mounted vise for assembly