Building a .308 AR-10 from a stripped lower receiver? The Luth-AR 308 Lower Receiver Parts Kit gives you everything needed to assemble a complete, function-ready lower without leaving your workbench hunting for missing pins or springs. Luth-AR manufactures these components to Mil-Spec standards using investment-cast or machined parts and certified mil-spec steel and stainless steel springs—no MIM shortcuts here. Whether you're a seasoned AR builder or finishing your first .308 platform rifle, this kit eliminates the guesswork and delivers American-made quality in a single package.

The complete kit includes all trigger, hammer, and fire control components, along with every detent, spring, pin, and retention piece your lower needs. The aluminum magazine catch button, A2 pistol grip, and selector/safety are included, so assembly is truly start-to-finish. Springs are mixed from 17-4 stainless steel and mil-spec steel wire—materials chosen for durability and reliable cycling. Each part is held to Mil-Spec drawings, materials, and heat treat standards, giving you the confidence that your lower will function and last.

If you're building multiple lowers or prefer a minimal kit, Luth-AR also offers a Builder Kit version that excludes the trigger, hammer, disconnector, and grip components, letting you source those separately or reuse existing parts. Either way, you're starting with parts made right here in the USA, engineered for precision, and backed by a maker that knows AR platforms inside and out.

Building a .308 AR-10 from a stripped lower receiver? The Luth-AR 308 Lower Receiver Parts Kit gives you everything needed to assemble a complete, function-ready lower without leaving your workbench hunting for missing pins or springs. Luth-AR manufactures these components to Mil-Spec standards using investment-cast or machined parts and certified mil-spec steel and stainless steel springs—no MIM shortcuts here. Whether you're a seasoned AR builder or finishing your first .308 platform rifle, this kit eliminates the guesswork and delivers American-made quality in a single package.

The complete kit includes all trigger, hammer, and fire control components, along with every detent, spring, pin, and retention piece your lower needs. The aluminum magazine catch button, A2 pistol grip, and selector/safety are included, so assembly is truly start-to-finish. Springs are mixed from 17-4 stainless steel and mil-spec steel wire—materials chosen for durability and reliable cycling. Each part is held to Mil-Spec drawings, materials, and heat treat standards, giving you the confidence that your lower will function and last.

If you're building multiple lowers or prefer a minimal kit, Luth-AR also offers a Builder Kit version that excludes the trigger, hammer, disconnector, and grip components, letting you source those separately or reuse existing parts. Either way, you're starting with parts made right here in the USA, engineered for precision, and backed by a maker that knows AR platforms inside and out.