Adjustment of the ADM-170-S quick detach lever to fit to a 1913 style Picatinny rail does not require tools and accommodates for both in spec and out of spec rail systems:

  1. Press on the locking button to release the lever
  2. Press on the lever to reveal the nut on the opposing side
  3. Make necessary adjustments by rotating the nut clockwise (tighter) or counter clockwise (looser)
  4. Ensure the flats of the nut align with the flats in the recess of the lever
  5. Close the lever — do not force the lever and over tighten to the rail

Download and Print Operating Instructions for the ADM-170-S

Video: How to Adjust the ADM-170-S Quick Detach Lever on the Atlas Bipod