The Strike Industries Enhanced AR-15 Complete Lower Parts Kit delivers a full SI solution for new builds or refreshes—everything you need to complete a mil-spec AR-15/AR-9 lower (minus the pistol grip). It includes SI’s refined fire control group with a crisp 5.5–8.5 lb pull and polished, precision-cut sear geometry for a smoother mil-spec trigger feel without sacrificing safety or reliability.
- Complete kit: all essential lower parts included (pistol grip not included by design)
- SI fire control group: longitudinally ground & polished sear surfaces; precision sear angle; 5.5–8.5 lb pull
- Enhanced ergonomics & aesthetics vs. basic LPKs
- Package Contents — SI Enhanced Lower Parts: Enhanced Bolt Catch; Magazine Catch; Magazine Catch Button; Enhanced Pivot Pin (longer of the two); Enhanced Takedown Pin (smaller of the two); Selector Levers (x2); Selector End Plate; 60/90° 3-in-1 Selector Shaft (with screws)
- Package Contents — Springs: Bolt Catch Spring; Buffer Retainer Spring; Disconnector Spring (slightly larger; one end wider); Hammer Spring; Magazine Catch Spring (largest coil spring); Pivot Detent Spring; Selector Spring (larger diameter than detent springs); Takedown Detent Spring; Trigger Spring
- Package Contents — Pins/Detents/Others: Bolt Catch Plunger (mushroom shaped); Bolt Catch Roll Pin; Hammer Pin (grooved; install from either side); Pivot Detent; Selector Detent (one flat end, one pointed); Takedown Detent; Trigger Pin (grooved; install from either side); Buffer Retainer (barrel with small protruding pin)
- Product Features: Includes SI signature enhanced parts (AREBC, SISMC, AREPTP, ARHS 60/90 3-in-1); SI springs yield a consistent 5.5–8.5 lb pull with the included FCG
- Trigger Group Details: phosphate-finished trigger and hammer; CNC-machined investment cast; heat-treated; precision-ground engagement surfaces
- 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
