Springfield Armory Echelon Complete Pin Set For Vis Black. The Variable Inface System employs patent-pending self-locking pins to complete the most advanced optics mounting system on the market. As the mounting screws are torqued to spec the pins exert lateral pressure on the optics interior mounting surface to eliminate variance and left/right movement. The result is an unparalleled fit between the slide and a wide variety of optics. Specifications for Springfield Armory Echelon Complete Pin Set For Vis: Manufacturer: Springfield Armory Color: Black Finish: Black Gun Make: Springfield Armory Gun Type: Pistol Fabric/Material: Steel Fit: Springfield Echelon Compact Springfield Echelon Full-Size Base/Mount Type: Top Mount Attachment Type: Screw Package Contents: Springfield Armory Echelon Complete Pin Set For Vis Springfield Armory EC5076-SET: Echelon Complete Pin Set For Vis Black