The G150 Lower Receiver is perfect for those that have a multi-use jig system like our Universal Jig!  For more info on the U-jig please click HERE

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 80% "reciever blank" is defined by the ATF and therefore has not yet reached a stage of manufacture that meets the definition of firearm frame or receiver found in the Gun Control Act of 1968 (GCA).
http://www.atf.gov/content/contact-us/pressroom/receiver-blanks-Q%26As