Warne 521LM is the Maxima Horizontal QD ring set in 34 mm, medium height, matte. Horizontal-split sintered-steel rings made in Tualatin, Oregon, with indexable quick-detach levers and Warne's return-to-zero guarantee when used as directed.

Four Torx T-15 cap screws, square recoil keys, STANAG 4694 interface. They fit Picatinny and Weaver-style bases. Medium height: dimension B is 0.37 inch; Warne lists clearance to a 52 mm objective. Pair weight 7.3 ounces.

Cap screws dry, 18 in-lb max, no threadlocker. This listing is 34 mm medium matte QD only.

• Manufacturer: Warne — Maxima Horizontal QD, 521LM, UPC 656813115082
• Tube / height: 34 mm; medium (B 0.37 in); to 52 mm objective
• Material: sintered steel; matte; 7.3 oz
• Mount: Picatinny and Weaver; square recoil keys
• Caps: 4 x T-15; 18 in-lb max dry