Bipod
A two-legged support that attaches to the front of the rifle, usually at a sling stud, ARCA rail, or Picatinny section.
A bipod under load is more accurate than a bipod free-floating. “Loading” means pressing the rifle forward into the legs so they bend slightly under tension. This resists recoil consistently shot-to-shot.
Atlas, Harris, and Spartan dominate the precision market. Cant adjustability matters for uneven ground; height matters for the terrain you actually shoot on.