https://midstatefirearms.com/product/ar15-standard-lower-parts-kit-lpk/

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Standard customizable lower parts kit for Ar15. ( lpk )

Complete LPK includes, Bolt Catch, Bolt Catch Plunger, Bolt Catch Roll Pin, Bolt Catch Spring, Buffer Retainer, Buffer Retainer Spring, Disconnect, Disconnect Spring,  Traditional Hammer (Black in Color), Hammer Pin, Hammer Spring, Magazine Catch, Magazine Catch Button, Magazine Catch Spring, Pistol Grip (A2 style), Pistol Grip Lock Washer, Pistol Grip Screw, Pivot Pin, Pivot Pin Detent, Pivot Pin Detent Spring, Selector, Selector Detent, Selector Detent Spring, Takedown Pin, Takedown Pin Detent, Takedown Pin, Detent Spring, Traditional Trigger (Black in Color), Trigger Guard, Trigger Guard Roll Pin, Trigger Pin, Trigger Spring.

Everything you need to complete a lower, other than the stock/buffer kit.