![Drill Bit Kit - 1/4"- 3 Flute - 3/4" LOC - 4" OAL - ZrN Coated 80% AR15-AR10 Lower Receiver Jig End Mill](http://www.americangunsmithtooling.com/cdn/shop/products/Optimus_defense_drill_bit_kit_1024x1024.png?v=1494547179)
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.
Replacement End Mills
Replacement Drill Bits
Optimus Defense Lower Receiver Jig Tooling Kit
How to Build AR-15 & AR-10 .308 80% Lower Receiver Video's & Instruction Manuals