The 18Xray by Darrel Ralph Designs has been a very popular automatic opener. It also has an NSN of 1095-01-568-8897.
The 18Xray is made from 154-CM premium grade stainless steel. It has a blade length of 3-13/16 inches and an overall length of 8-7/8 inches with anodized 6160 aluminum slabs which incorporate a lanyard hole as well as pocket clip. It’s quite a robust knife which integrates Darrel’s SAS (Slide Auto Safety). Instead of a simple button that can actuate in your pocket, with the SAS you have to push the button forward and down to open the blade. It also offers a very positive lock.