The issue with the ARMS mount basically comes down to tolerance stacking. There is a tolerance (degree of error) in the mount spec where it attaches to the rail. The rail itself (on your upper receiver) also has a tolerance. ARMS mounts are notorious for either being loose when locked, or being so tight that they damage the rail. Conversely, ADM, Larue, and Boboro use either a screw adjustment (ADM/Larue) or a self-adjusting spring (Boboro) that accommodates the variances in tolerances.
Semper Paratus Certified AR15 Armorer
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