You probably won’t find the right tool bits for your jig and 80% lower receiver at the hardware store -- those bits are usually made of cheaper, lower-carbon steel or carbide. We prefer to offer gunsmiths like you the right stuff for aluminum: HSS bits, like this set in AMT’s 80% Jig Tool Kit.
Designed to work with the Elite Builder Jig, this bit set can be used for any AR-15, AR-9 or AR-10 (LR-308) jig and lower.
HSS Bits Are Best for Your 80% Lower HSS (high-speed steel) bits are often the best choice for cutting and drilling a billet or forged 80% lower: They’re much less expensive than carbide bits, they excel at withstanding high cutting forces, they may last longer, and they’re less likely to break while working.
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