Fixed Picatinny Interface; A.R.M.S. 17S universal head interface accepts multiple mounting configurations; Reversible head; 44 degrees of total cant range; Cant tension lever; One-handed adjustability; Rapid leg deployment from horizontal; 3 additional leg positions at 0, 45, and 90 degrees; 13 height adjustment increments; 13in extended footprint; Accepts Atlas-style feet, except 5H or Supercal sized