To make it easy on you remove the magazine the stigma is disassembled the same way that the Glock pistols first you remove the magazine make sure there's no bullet in the chamber after that cycle halfway the slide at the same time pressing on the trigger the slide engaged press upwards push back the slide just a little bit and pull up the gun slide comes apart upwards then you're able to remove the slide completely then you may start disassembling the barrel the spring it's on the barrel press forward and remove the barrel then you may start cleaning the gun piece by piece if you want to disassemble the gun completely and you don't have the experience please take it to a qualified gunsmith thank you very much sincerely yours Jose A Velez please refer to the manual if you have any questions contact Smith & Wesson they will help you on the telephone Smith & Wesson is your great company when buying guns from Smith & Wesson for a very long time this particular gun operates the same way that the Glock 17 or any to Glock basically it works the same way that Block works