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The Luth-AR LRPK-BLDR-308 .308/7.62 Lower Parts Builders Kit is a high-quality mil-spec builder kit containing all the essential non-fire-control components needed to complete an AR-10 lower receiver assembly. This kit focuses on the critical pins, springs, detents, catches, and selectors while allowing you to choose your own trigger group. All parts are investment-cast or machined to strict mil-spec standards, with no MIM components, ensuring reliable performance and long-term durability.

Finished with manganese phosphate and other corrosion-resistant coatings, this builder kit is perfect for custom builds, gunsmiths, or anyone wanting flexibility in their .308/7.62 AR-10 project.

Features

  • Complete .308/7.62 AR-10 Builder Lower Parts Kit (no trigger group)
  • Includes buffer retainer, bolt catch assembly, magazine catch, safety selector, takedown/pivot pins, and all necessary springs and detents
  • Investment cast and machined to mil-spec drawings with proper heat treat
  • Manganese phosphate finish on key components for corrosion resistance
  • High-quality 17-4 stainless and mil-spec steel springs
  • Compatible with standard DPMS-pattern AR-10 lower receivers
  • Proudly made in the USA by Luth-AR


Kit includes:

  • Selector
  • Bolt Catch Spring
  • Detent Spring
  • Bolt Catch Button
  • Take Down Detent
  • Bolt Catch
  • Magazine Catch Spring
  • Bolt Catch Roll Pin
  • Magazine Catch Button
  • Magazine Catch
  • Front Pivot Pin
  • Selector Spring
  • Detent Selector
  • Hammer Pin
  • Trigger Pin
  • Take Down Pin
  • Buffer Retainer Pin
  • Buffer Retainer Spring