Parts by category

AR-15 starter builds

Complete parts lists we put together and keep priced: every part, today's lowest price at the stores we track, and a compatibility check. Open one in the builder to make it your own.

Budget AR-15 build under $600

The cheapest way to a complete, reliable AR-15 is to buy it in two halves: a complete lower and a complete upper that pin together with no gunsmithing. …

$562.54 6 partsSee the parts
300 Blackout AR-15 build

300 Blackout gives an AR-15 a .30-caliber bullet while keeping the same lower, bolt carrier group and magazines as 5.56: only the barrel changes. This build uses a …

$632.74 6 partsSee the parts
Home defense AR-15 build

A home-defense AR-15 has to be reliable, handy indoors and able to light up what it's aimed at. This build pairs a complete lower with a 16-inch mid-length …

$1,036.32 9 partsSee the parts

Want to start from scratch? Open the AR-15 builder, or browse completed builds from other builders.