Compatible Upgrade Optimus Defense 80% AR-15 Lower Receiver Jig "TiN" Coated Drill Bit Kit
AGT's Kits are A Significant Upgrade to all kits on the market
"TiN" Coated high speed steel drill bits, custom cut to our specifications.
OptimusDefense.com compatible 80% AR-15 Lower Receiver Jig "TiN" / Bronze Oxide coated high speed steel drill bit kit. 100 % American Made. Simply the best drill bits.