Your first? Drink responsibly! BTW if you're buying another one, pick me up a lottery ticket and a copy of The Jail Report.....and a box of Pampers.
That would be a MAC-10 clone. I have an RPB Industries MAC-11 upgrade/clone. 9mm, in other words. I don't want a MAC-10 version until I've gotten used to .45ACP again, and this little gun is a good start on that.