This Jet City Universal rail is 6.13 inches long and is machined from solid aluminum, then black anodized. Professional design let you clamp to any standard 3/8 dovetail. We call our rails the "JCS 7/8 Modified-MIL-SPEC-1913 Accessory Mount". It accepts any quality accessory that requires a Weaver, Picatinny, or 7/8 mount. Securely installs with a Phillips medium (#1 size) screw driver to provide a rigid accessory mount.
Additional search terms: JCS Rail