Does HK USP EXPERT on roster?

[seainc]

Got this from DOJ website:
USP 40 Exp.V9 / Steel, Polymer Pistol 5.20" .40 S&W 12/31/2012
USP 45 Exp.V1 / Steel, Polymer Pistol 5.20" .45 ACP 12/31/2012

I guess Exp.= EXPERT but what does V9 and V1 means?

I'm interest in this one http://www.gunbroker.com/Auction/Vie...Item=287641193

[mc21]

V is variant.

[sirgiles]

google is your friend.

http://en.wikipedia.org/wiki/Heckler_%26_Koch_USP