The LANTAC M-SPEC Lower Parts Kit is designed for AR15-style rifles and manufactured to strict quality standards using the correct materials, heat treatments, and finishes-fully compliant with current military specifications. This kit includes all essential lower receiver components (excluding trigger group and grip), making it ideal for new builds or replacement purposes. Included Components: Takedown Pin Pivot Pin Pin Detents A-2 Detent Springs A-2 Ambidextrous Safety Selector Safety Detent Safety Detent Spring Buffer Retainer Buffer Retainer Spring Bolt Catch Bolt Catch Plunger Bolt Catch Spring Bolt Catch Roll Pin Bolt Catch Set Screw (6-32, compatible with LANTAC, Aero, and other lowers - 1/16" Allen key head) Magazine Catch Magazine Catch Spring Magazine Release Button