The Luth-AR Builder Lower Parts Kit (brand part number LRPK-BLDR) is built to complete an AR-15 lower receiver chambered in .223 Remington/5.56 NATO. Luth-AR packages this kit for builders assembling a lower from a stripped receiver, giving them the parts needed to finish the fire control group and related lower hardware in one purchase. It pairs naturally with a stripped AR-15 lower receiver and a stock or buffer tube kit to complete a home-built rifle from the ground up. Builders who want a straightforward, no-surprises parts kit for a standard .223/5.56 AR-15 lower will find this a practical option.

Key Specifications

• Chambered for .223 Remington/5.56 NATO AR-15 builds.
• Classified as a Lower Parts Kit, built to complete a stripped AR-15 lower receiver.
• Sold under Luth-AR’s Builder line, aimed at home-build lower assemblies.

Frequently Asked Questions

What caliber is this kit built for? .223 Remington/5.56 NATO AR-15 builds.

Do I still need a buffer tube and stock? Yes, this is a lower parts kit; a buffer tube assembly and stock are sold separately to complete the lower.

Who is this kit for? Builders assembling an AR-15 lower from a stripped receiver who want a straightforward parts kit.

Buy the Luth-AR Builder Lower Parts Kit

Order the Luth-AR Builder Lower Parts Kit from our Lubbock, Texas gun shop for fast, insured shipping. See more Luth-AR AR lower parts kits for your build.