what is a stripped lower receiver on an ar 15?

Answer 1

Bound's hubby here:

A "stripped lower receiver" on an AR15 is the housing that would contain the trigger and hammer assembly, the pistol grip, the stock and buffer assembly, and the magazine. If you go to the following link, you will see what a "stripped lower receiver" looks like: http://www.bushmaster.com/shopping/lowers/9349102-s.asp .

Good luck!