Spike's Tactical set out to offer the best factory lower parts kit on the market! The lower parts kit they came up with exceeds military specifications by a long shot, they also have a much better fit, and finish! 100% made in the U.S.A. with a lifetime warranty. This parts kit was specifically designed to be used with Spike's Tactical’s forged sets, which are generally sold with takedown and pivot pins installed, and may not be compatible with any other large frame lower receivers.  This kit does not include pivot or takedown pins. Kit includes: