Compatible Upgrade Modulus Arms 80% AR-15 Lower Jig "TiN" Drill Bit Kit
Our kits are a SIGNIFICANT UPGRADE to any kits on the market
"TiN" Coated high speed steel drill bits, custom cut to our specifications.
Modulus Arms Jig Tooling Kit
Replacement End Mills
Drill Bits
How to Build AR-15 & AR-10 .308 80% Lower Receiver Video's & Instruction Manuals