2 rail. I've shot 18s with rifle fuel like how easy and exact they are. I am able to place more cash into performance pieces then clone suitable pieces similar to a ops brake and collar that I don't have a can for. Posted by BRAD on twenty third Jan https://kaccarbinerail29628.bloggazzo.com/28979171/the-5-second-trick-for-knights-armament-drop-in-rail