Since its introduction to the marketplace in 1989″ this foundation has maintained its reputation as being the best mounting systems for the M21/14 Rifle. The A.R.M.S.(R) #18(TM) offers interchangeability of Day & Night Vision, with an ultra low profile and the A.R.M.S.(R)/SWAN(R) aka Mil-Std. 1913 Rail.
- 8620 case hardened steel
- Two attaching points plus a third contact point for stability