From information provided to me by Small Arms Solutions, the Colt-branded A.R.M.S. #5 multibase mounts were provide with Colt Sporter Competition HBAR ‘Range Select’ model of AR-15 rifles. The A.R.M.S. #5 mount has been discontinued for many years and has been replaced in the A.R.M.S. product line-up by the A.R.M.S. #63.
The information below is from the Atlantic Research Marketing Systems website www.armsmount.com
A.R.M.S.® #05™ Multi-base Mount NSN 5855-01-491-3604
One of the most versatile mounts on the market. Made of extruded aluminum with a Mil-spec black hard coat. 100% MADE IN THE USA.
The #05™ Multibase is a Quick detachable, multiple eye relief mounting base that attaches to weaver type rail and flat-top receivers. The multibase is compatible with both weaver style rings and NATO STANAG mounts. It raises your sight platform 3/4″ and features a spring loaded clamping bar and self locking captivated thumbnuts for solid, zero movement mounting to your existing rail. The #05™ multibase also features a see through channel for use with iron sights. Also available with Throw Levers® – see #63.
Weight – 5.2 oz
Length: Approx. 5″
Height: Approx. 3/4″