80% Lowers can be made in many different materials that each have their benefits in ease of manufacturing and overall finish when complete.
Particularly 6061-T6 Billet Aluminum is a near-identical alloy used most commonly in modern AR-10 lower receivers. The Suffix “-T6” is an indicator of how the aluminum alloy was heat treated & tempered to give it improved strength and corrosion resistance, before bluing or finishing the lower with a cerakote or anodizing.
Many 80% AR-10 Receivers will be made from Forged Aluminum 7075-T6, 6061-T6, and Composite Polymers.
The lower receiver of an AR-10 is essentially the backbone of the weapon everything else is built off of, it is what makes an AR-10 a firearm. An 80% lower receiver is exactly what it says, it is a lower receiver that is 80% complete. By it being 80% complete it is considered a normal part and not a serialized firearm, so it is legal to purchase without the need of going through a background check or a local gun dealer.
Product info: The Gauntlet Arms LR-308 Billet 80% Lower is a commercial-spec lower with unique cuts and details CNC machined in. Featuring precision CNC cuts and no selector switch engravings added in for ease of manufacturing and customization.
Brand: Gauntlet Arms
Model: LR-308 Billet 80%
Material: 6061-T6 Billet Aluminum
Finish: This 80% Lower comes in an unfinished state and must be completed by the end-user. NOTE: This 80% does not need to be finished (ex: Cerakote, Anodizing) for it to be fully functional.
Feature: The Billet 80% Lower by Gauntlet Arms is a sleek and flat finish featuring a Magpul style mag release cut.
About the Brand: Gauntlet Arms is dedicated to making affordable and easy to manufacture 80% Lower kits with the highest quality 6061-T6 Billet Aluminum.
Integrated Trigger Guard: The Gauntlet Arms LR-308 80% comes with an integrated trigger guard into its design for a uniform finish in your build.
Jigs and Bits: This LR-308 80% Lower does not come with a Jig and the Bits needed to complete the build.
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