Multiple proprietary recoil lugs ensure total rail engagement; Easily remove and re-attach without needing to confirm zero; Ensures optimal placement on MIL-STD 1913, NATO, non-mil spec, and even damaged rails; Heavy-duty springs ensure secure retention under heavy, repeated recoil; Facilitates one-handed mounting; Machined from 6061 aluminum for outstanding, repeatable performance; Compact, circular design minimizes hazards of gear snags