LUTH-AR | Lower Parts Builder Kit AR-15 | .223/5.56

The Luth-AR Lower Receiver Parts Builder Kit supplies the components needed to assemble a mil-spec AR-15 lower. Components are American-made and built to MIL-SPEC drawings, materials, and heat-treat standards. Springs are produced from certified 17-4 SST and MIL-SPEC steel wire and the kit is finished in black for a consistent appearance. This kit is intended for use in AR-15 platform builds and repairs.

Product Specifications

• The manufacturer is LUTH-AR.
• The product is a Lower Receiver Parts Kit for AR-15 platforms.
• The kit is compatible with AR-15 style lower receivers.
• The listed caliber/gauge is .223 REM/5.56 NATO.
• The finish color is Black.
• The components are American-made.
• The included parts are investment cast or machined to MIL-SPEC drawings.
• The materials are produced and treated to MIL-SPEC heat treat standards.
• The springs are made from certified 17-4 SST and MIL-SPEC steel wire.
• The kit contains no MIM parts where specified by the manufacturer.
• The item category is AR Lower Parts Kits.
• The subcategory is Long Gun Parts.
• The listed make/model compatibility is AR-15.
• The product type is Lower Parts Kit.
• The UPC is 859992007654.

This builder kit provides durable, traceable components intended for reliable function in range and competition-oriented AR-15 builds or for technical training assemblies. The focus on machined and cast parts with certified spring materials makes it suitable for users who prioritize MIL-SPEC conformity and component traceability.