With this system, there are no expensive jig kits and parts to purchase. This is an all-inclusive AR15 80% lower receiver and jig package for one great price! The Phoenix, Gen2 version features Polymer80's proprietary polymer composite, a solid core design, stiffened magwell and beefier MILSPEC buffer tube housing. The pistol grip area features a unique no-thread design specific to Polymer80 lowers. The kit also comes with drill bits and the end mill bit that's required to finish your AR project the right way. The best part about it is there is no FFL required to purchase.