Yes
I just ordered some goods from Mr. Reed via my work connection. My company doesn't seem to bother folks unless their looking at smut. Those folks that do, frequently disappear soon after.
I surf Gunbroker and AuctionArms at work frequently. It's a good break during the office day since I no longer work in the labs or the factory. BTW, cubicles are depressing.
I may have even completed an auction on a firearms related site and definitely an ebay auction or two, but mostly due to auction timing. I don't make a habit doing any more than perusing and adding items to my watch lists. Either way, never been an issue that my employer has brought to my attention.
jeepmor