A.R.M.S.® #19 Throw Lever® Mount U.S. Patent No. 5,276,988 & 4,845,871. NSN 1005-01-469-7050. 100% MADE IN THE USA. Aluminum base secured by steel feet and levers with A.R.M.S.® no-mar patented Buffer Pads. Interfaces to M16A1/A2 and M4, provides universal platform, NATO STANAG and Weaver type standards combined for many day and night vision optics and lasers. SOLD.