The CMC AR-15 Lower Parts Kit features a premium 3.5lb single stage curved trigger making it an excellent choice for your AR-15 build whether you're an amateur gun builder or seasoned gunsmith.CMC AR-15 Lower Parts Kit with 3.5lb Single Stage Curved TriggerComplete 17-piece kit including bolt catch magazine release safety selector trigger guard takedown pins and springsAll parts meet or exceed MIL SPEC standardsCompatible with standard AR-15 lower receiversNote: Pistol grip NOT includedThis comprehensive lower parts kit provides all the essential components needed to complete your AR-15 lower receiver assembly delivering reliable performance and smooth operation for both recreational and professional applications.