I have an ar15 made by PWA, can anyone tell me what this stands for and how I can get in touch with them.

PWA, PacWestArms, Washington State I believe. I know that they are out of business. A couple of years ago, several dealers (including Rock River) were selling stripped PWA lowers for around $95. I bought one and wished that I got five more. Quality is excellent. PWA has been discussed before on this board.I believe that they (PWA) made and sold some complete rifles; however, it seems that many more stripped lower receivers were sold than complete rifles. Ask the person that sold it to you "who assembled the rifle".

My PWA lower is stamped "Milan, IL" (as in Illinois, not Italy, but definitely not Washington state.)  Everything else ArmyOrdGuy posted is correct as far as I know.  Very nice quality lower reciever.