An AR-9 jig is a precision tool designed to assist in completing 80% lower receivers for AR-9 pistol caliber carbines chambered in 9mm. It guides the drilling and milling operations needed to finish the fire control group cavity and pin holes accurately. The AR-9 jig works with 80% AR-9 lower receivers and is compatible with AR-9 upper receivers, lower parts kits, buffer tubes, stocks, and magazines. It’s essential for DIY builders seeking to complete and assemble custom AR-9 pistols or carbines.
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