AR-15 Parts & Build Kits
Everything you need to build, upgrade, or customize your AR-15. Stripped lowers, complete uppers, mil-spec triggers, handguards, buffer kits, and more.
Featured AR-15 Parts
Shop by Category
AR-15 Lower Receivers
Stripped and complete lower receivers from trusted manufacturers.
AR-15 Build Kits
Complete kits minus the stripped lower. Rifle, pistol, and SBR configurations.
Parts & Accessories
Buffer kits, charging handles, gas blocks, muzzle devices, and LPKs.
Build Your AR-15 From the Ground Up
AR-15 Parts Direct carries a complete selection of AR-15 components for builders and shooters. Whether you are starting from a stripped AR-15 lower receiver and need a complete ar15 build kit, or looking for a drop-in AR-15 trigger upgrade, our inventory covers every step of the build.
We stock AR-15 upper receivers in popular barrel lengths — 16″ for rifles, 10.5″ and 11.5″ for pistol and SBR builds. All uppers are chambered in 5.56 NATO or .223 Remington with chrome-lined or nitride-treated bores. Our AR-15 accessories section includes mil-spec buffer tube kits, enhanced bolt carrier groups, ambidextrous charging handles, adjustable gas blocks, and free-float M-LOK handguards.
For shooters who want a turnkey solution, our AR-15 build kits include everything you need minus the stripped lower — upper assembly, lower parts kit, buffer kit, and stock. Just add your serialized AR-15 lower receiver and you have a complete rifle ready for the range.