This is a great little rifle. I had one when they first came out and could drive nails with it. Subsequently had it stolen but found one this week on Gunsbroker.com ($170). Here's a photo that I "photomerged" from their website.Only thing I know is that it is a single shot version of the 320.
Price sounds 'bout right. If you get a chance to get a picture of it post it would you.
From what I found with a quick google search they are good shooting smooth bolt action 22 rifles.
If I were you and had the extra c-note I would grab it quick.