COLT .223 REM/.5.56MM NATO LOWER RECEIVER PARTS KIT FOR AR-15 The Colt AR-15 Lower Parts Kit provides the core internal components needed to complete or refurbish a mil-spec lower receiver, delivering the same dependable function Colt builds into its factory rifles. Each part is manufactured to Colt's precise standards for fit, durability, and smooth operation, giving builders a reliable foundation for any AR15 project. Whether you're assembling a new lower, replacing worn controls, or standardizing a fleet of rifles with proven OEM hardware, this kit supplies the essential steel and polymer components required for consistent, battle-tested performance. &nbs Mfg: Colt