Check your regs. It wouldn't be legal in my neck of the woods. Squirrels here in Texas are considered a game animal. We have a 25" minimum overall crossbow stock length and 125 lb minimum draw weight for hunting all game animals.

Now, rabbits on the other hand...

Oh, by the way, there is a helluva lot of difference in power between a 70 lb bow and an 80 lb crossbow. Because of the short power stroke, you have to divide the crossbow's poundage by 3 to get the rough equivalent of power you get from a bow. That 80 lb crossbow pistol has about as much oomph as a 27 lb recurve - and even that is probably way too generous an estimate. Not quite a 'toy' but definitely not a real hunting weapon either.