Lantac M-SPEC Lower Parts Kit (LPK) for AR15 style rifles. - Manufactured to the highest quality standards using correct materials heat treatments and finishes to comply with up to date military specifications. - Kit includes the following: - Takedown Pin - Pivot Pin - Pin Detent x2 - Detent Spring x2 - Ambidextrous Safety Selector - Safety Detent - Safety Detent Spring - Buffer Retainer - Buffer Retainer Spring - Bolt Catch - Bolt Catch Plunger Spring - Bolt Catch Plunger - Bolt Catch Roll Pin - Bolt Catch Set Screw (6-32 compatible with Lantac Aero and other lowers). 1/16th Allen Key Head - Mag Catch - Mag Catch Spring - Mag Catch Button - Lifetime Warranty - Made in the USA.