The Blue Line Solutions/Mauser MP-40 22LR rimfire carbine features an adjustable rear sight, faux suppressor, and a folding stock. Each carbine ships with one 23 round magazine.
Fun to shoot, looks great, and magazines are out there.
This is an accurate plinker. I love shooting it. I wish that I could find magazines for it. When the one I have wears out, then the whole rifle is rendered useless. It feels like I am on borrowed time.