Let's face it.  This is the kit most people want.  Pick your trigger, pick your grip, and Uncle Bill provides you with an amazing base LPK with the crazy perfect trigger guard in DDC and the Maritime bolt catch.  What is not to like.  Is is expensive?  Yeah, a little. But, it is a great lower parts kit.  Great from an engineering perspective, and great from a design perspective.

Geissele Ultra Duty Lower Parts Kit (LPK) in DDC - no grip - no fire control