The knurled knob can be screw in and out but not pulled. The more I screw the button in the harder the button on the left hand side of the trigger gets, as I loosen the screw the easier it gets to pus ...
There doesn't seem to be anywhere to cock it and no place to insert a BB. Unless it's through the barrel itself (muzzel loaded). The barrel is not rifled. ....maybe it is a "Super Soaker".. ...
Lol, it's def. odd looking...That was my first thought too.. a modification. But looking at it closely, I'm pretty sure it's not a modification. ...just can't figure it out or find anything on "M ...