System Defence (Glock 19 Replica) , The C9 is a semi-automatic handgun that operates with 9x19 ammunition with a magazine capacity of 15+1. It offers users a very safe use with its three-point safety system. The C9 handgun has 102mm standard and 112mm long accessory attachable barrel options. The lower frame of the C9 handgun is made of polymer material and offers high strength as well as lightness.