Cutting and drilling your 80% lower receiver can be a breeze, or a pain -- it truly depends on the drill bits and end mill bits you use to machine it. That’s why you need to invest in the highest quality bits available, like this 80% Jig Tool Kit from AMT. These HSS bits are designed for the Elite Builder Jig, but they can be used with any 80% lower receiver designed for the AR-15 and AR-9.
Aluminum-Ready HSS Bits
We like to offer HSS (high-speed steel) bits for completing 80% lowers because they provide some of the best results when machining billet (6061-T6) or forged (7075-T6) aluminum. Sized bit shafts reduce flex while working, and razor-sharp flutes make quick work of raw metal with clean, polished results.
The quality of your 80% lower’s finished results is only as good as the drill bits and end mill bits you use to cut and drill it. You need precise, rugged bits like this Elite Builder 80% Jig Tool Kit. Designed as a replacement set for the Elite Builder Jig, these bits can also be used with any other 80% jig designed for the AR-15/AR-9 and LR-308 lower receivers.
HSS Bits Provide the Best Results
We stick to HSS (high-speed steel) bits for the jigs and 80% lowers as well because they’re specifically designed for tackling tough billet and forged aluminum. A spread of short- and medium-length end mill bits coupled with razor-sharp flutes make cutting the fire control cavity quick and easy.
- (1) 3/8 Drill Bit - 5”
- (1) 5/32 Drill Bit - 3”
- (1) 3/8 Short End Mill - 3”
- (1) 5/16 Short End Mill - 4”
- (1) 3/8 Long End Mill - 4”
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