Mystery 22

Last November I went to a gunshow. Among other things, I saw a neat little 22 rifle with a pencil-thin barrel and a stock which retracted inwards in the same manner as HKs. It seemed extremely lightweight. I wrote than brand and model down, looked up the company's website, threw the paper away, and forgot about it. All I remember is that the maker's name started with an 'M' (I think). Can anyone tell me who makes it and what it's called?

BTW, I know this sounds impossible, but it's more probable for someone to come up with the answer than it is for me to remember it myself. : Whoever can tell me what it is will become my offical hero of the day...