Strike Industries Enhanced AR-10 Lower Parts Builders Kit - The Strike Industries Enhanced AR-10 Lower Parts Kit (Builders Kit) is a convenient upgrade package designed for AR-10/LR-308 builds, providing the essential components needed to complete your lower receiver. This kit is ideal for builders who want a complete Strike Industries solution while maintaining the flexibility to choose their own pistol grip and trigger. It also includes spare springs for mil-spec triggers, making it easy to refresh existing components when needed. Featuring Strike Industries Enhanced Parts, this kit offers an upgraded look and enhanced functionality compared to a standard lower parts kit. Features: Strike AR-10 Enhanced Bolt Catch (SI-AR-EBC); Strike Magazine Catch - Black (SI-AR-SMC); SI Extended Pivot / Takedown Pins (SI-AR10-EPTP) (coming soon); HEX Selector Switch 60/90 degree 3 in 1 (SI-AR-HS-60/90-3in1); -Freedom to pick your own AR trigger group (AR hammer and trigger springs + pins are included) -Included SI enhanced components at a cost-effective LPK price -Perfect pairing with one of the various SI AR Grips available; Package Contents: Strike AR-10 Enhanced Bolt Catch - features improved grip surfaces and angles; Strike Magazine Catch; Strike Magazine Catch button - features improved grip surface; SI Extended Pivot Pin - longer of the two large pins; SI Extended Takedown Pin - smaller of the two large pins; HEX Selector Switch - x2 included; HEX Selector Switch end cap; HEX Selector Switch 60/90-Degree shaft with screws - x1 shaft and x2 screws;