This is a RAP4 suppressor. Originally it was made for a paintball gun however I have an adapter that makes it fit on 14mm ccw threads. This suppressor acts more like an amp because of the fact that the hole where the bbs come out is bigger than usual. The suppressor is in great shape. Price about is shipped. Only trades: -well r4 aep mp7 in good condition -CYMA cm.030 (aep g18) in good condition