Start your new rifle project now with this 80 Percent .308 Black Lower Receiver Kit from Polymer80. The innovative and unique reinforced polymer design has a solid core, stiffened magwell and beefier buffer tube ring and ribbing. The pistol grip area features a unique no-thread design specific to Polymer80 lowers. The improved jig system has an additional insert to assist with trigger hole drilling. The kit also comes with drill bits and the end mill bit that's required to finish your rifle project the right way.