LANTAC M-SPEC LPK. AR15 Lower Parts Kit Black. 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 and Mag Catch Button. Specifications for LANTAC M-SPEC LPK. AR15 Lower Parts Kit: Manufacturer: LANTAC Color: Black Gun Model: AR-15 Gun Type: Rifle Features of LANTAC M-SPEC LPK. AR15 Lower Parts Kit Lifetime Warranty Package Contents: LANTAC M-SPEC LPK. AR15 Lower Parts Kit LANTAC 01-PKIT-LP: M-SPEC LPK. AR15 Lower Parts Kit Black