Arms M21/14 Mount Foundation

The A.R.M.S., Inc. M21/14 Mount Foundation (model #18) represents over three decades of proven performance as a mounting system for M21 and M14 rifles. Since its 1989 introduction, this mount has earned its reputation among precision rifle operators and military armorers for delivering a low-profile interface compatible with both day and night vision optics. The foundation utilizes 8620 case-hardened steel construction with a dual-point attachment design plus a third contact point for enhanced stability under recoil and field handling.

The Mount Foundation's robust steel construction and two-point mechanical attachment system provide the rigidity required for zero retention on precision rifles where scope creep means a missed shot or failed mission. The 8620 case-hardened steel maintains hardness under repeated mounting cycles and field abuse. Weighing just 0.5 pounds with compact dimensions of 4 x 1 x 7.5 inches, it adds minimal profile to the rifle while the integrated Mil-Std-1913 (SWAN) rail allows quick transitions between day optics and night vision equipment without requiring remounting or re-zeroing between systems.

The A.R.M.S. #18 Mount Foundation serves operators and military personnel who rely on M14 and M21 rifles for designated marksman, sniper, or general rifle roles where optic flexibility and absolute stability are non-negotiable. This foundation is used in both training environments and operational settings where the rifle's duty demands reliable optical mounting. Armorers maintaining military rifle inventories choose this system for its proven track record of zero retention and compatibility with standard accessory rails, eliminating the need for proprietary mounting solutions.