The file 'Sound Moderator Mk2 3D Printer Model' is (scad,stl) file type, size is 84.4KB.
This is a sound moderator aka "silencer" for an airgun or paintball gun. Pump-up airguns in particular make a lot of noise as the air rushes out, and the moderator cotains a series of what are called "K Baffles" (see cutaway one in the photo) that slow it down so that it does not make a sharp >Crak!< The pellet goes unimpeeded down the middle, and may even slightly gain velocity. This design is remarkably efficient.
Supersonic projectiles will always go crack anyway and a silencer is pretty pointless with them. Firearms are likely to blow the silencer to bits.
silencer2.scad | 2.3KB | |
silencer2.stl | 1.2MB |