I don't know what that lever is beneath rear of the scope, but it looks a little awkward. If it's to discharge a shell casing from the firing chamber, a right-handed shooter would have to take his hand off the trigger to use it. Also the scope looks like it could use a little more support. Other than that, though, it's an amazing design.
Love the design! One thing I haven't seen yet is someone putting a hand and arm attached to the front of the gun, like you would see someone holding one in real life. Sorta like in real life. Other than that, it's amazing!