a suppressed barrel for the KJ Works/ ASG/ Evoloution Airsoft MK1 pistol / Ruger. designed to replace the original barrel and secured through a 3 mm tapped hole on the underside of the pistol. after printing the hole through the middle will need reaming if an inner barrel is to fit as the printing process isn't perfect and makes it a very tight fit. if you want to use this on a MK1 carbine receiver (like i do) then you need to turn one end down to fit inside the receiver as it is longer than the pistol variant. you will also have to drill and tap a new hole in the part and the receiver as the hole for fixing is in a different place. hole at the base of the barrel needs tapping out to 3mm. cavity at end of barrel needs filling with foam to create the suppressor end cap needs to be glued on once cavity is filled. this will only fit the pistol variant of the KJW Ruger as the Carbine version has a longer upper receiver.