Deleted primary weapon after joining server

[roguerazr 8]

Date/Time: 7/9/12 12:45pm PST

What happened: My primary weapon was deleted from my inventory.

It was a L85A2 TWS that I legitimately looted from a heli crash.

Where you were: South of NW airfield

What you were doing: Just installed patch and logged in

*Current installed version: 1.7.2/94444

*Server(s) you were on: US 404

*Your system specs: N/A

*Timeline of events before/after error: I logged out last night after just looting a heli crash on the 1.7.1.5 patch. I had my L85A2 in my primary inventory, a PDW in my primary inventory, and a Bizon in my backpack. I manually installed the new 1.7.2 patch today. Upon login, my character had switched to his secondary weapon, and my L82A2 was missing. The rest of my inventory including the Bizon in my pack was all intact.