The Strike Industries Enhanced AR-15 Lower Parts Kit (Builder’s Kit) upgrades or completes AR-15/AR-9 lowers with SI’s enhanced controls and all essential small parts—while letting you choose your own pistol grip and trigger group. Cleaner ergonomics, smarter details, and a better build than a basic LPK.
- Builder’s Kit: essential lower parts; excludes pistol grip and mil-spec trigger components by design
- Includes SI Enhanced controls: AREBC bolt catch, ARSMC mag catch + button, AREPTP extended pivot/takedown pins, ARHS 60/90 3-in-1 selector
- Trigger and hammer springs included; tuned to deliver ~4.5–5.5 lb pull when paired with SI fire-control group
- Thoughtful shapes and textures for faster, more confident manipulation
- Package Contents — Springs: Bolt Catch Spring; Buffer Retainer Spring; Disconnector Spring; Hammer Spring; Magazine Catch Spring; Pivot Detent Spring (x1); Selector Spring; Takedown Detent Spring (x1); Trigger Spring
- Package Contents — Enhanced Parts: Enhanced Bolt Catch; Magazine Catch; Magazine Catch Button; SI Extended Pivot Pin; SI Extended Takedown Pin; HEX Selector Switch (x2); HEX Selector End Cap; 60/90-degree Selector Shaft (with screws)
- Package Contents — Pins/Detents/Others: Bolt Catch Plunger; Bolt Catch Roll Pin; Hammer Pin; Pivot Detent; Selector Detent; Takedown Detent; Trigger Pin; Buffer Retainer
- Product Features: Includes signature SI Enhanced parts (AREBC, ARSMC, AREPTP, ARHS 60/90 3-in-1); springs provide a consistent ~4.5–5.5 lb pull with SI FCG
- Compatibility: AR-15 and AR-9 mil-spec lower receivers
- Not Compatible: AR-10 for bolt catch, bolt-catch roll pin, pivot pin, and takedown pin
