OP, if you go to the Forward Operating Base section of this site and go to the subsection at the bottom of FOB you will find a thread that identifies that info. Or you could go to Calguns or any number of other resources.
Not that I would want to manipulate you, but I would have your friend post his experience for all to see... this is just a suggestion, and not a manipulation.
Details matter, reactions when informed of a potential problem, correspondence between the parties, etc.