This is a ASG spas 12 with a Tokyo Marui folding stock Comes with 2 shells and has never been skirmished only backyard plinking **the asg does not have mounting hardware like the Marui one so I had to drill holes and use screws to hold it on, to unfold it you must unscrew one screw and then unfold the stick and screw it back in holding in place** The stock has not been modified in anyway and will mount on a Marui spas 12 if you have one