Made this a while back, mainly as a sort of demontration project, to show that a toploading gun can be made based on my semi-auto mech. The mag is removable, it comes with the standard safety and has the under-barrel rails for my standard gear. I will not be posting an I'ble so if you want to make it you'll have to make do with these images.
Warning- These K'nex projects may cause harm or injury if misused. Do not point it at people. I am not responsible for damage, injury, or death caused by this instructable. Treat these as potentially dangerous objects.