I think a lot of members are confused on this thread.
AR500
ARMOR (this subforum)
and
AR500
-TARGETS
ARE TWO DIFFERENT COMPANIES
AR500 Armor is based in AZ
http://www.ar500armor.com/ (go to the bottom of the page for their address)
AR500-Targets is local to SoCal
http://www.ar500-targets.com/aboutus.asp
Seems like the OP was posting about AR500 Armor.
I dealt with AR500-Targets before. They are very responsive.
I have not dealt with AR500 Armor though.
AR500 (Abrasion Resistant) describes the hardness of steel.
It is a rating system for how strong a target is. They also have AR400 and AR500+ for targets.