FAB Defense GL-CORE IMPACT Buttstock is a black synthetic shock-absorbing stock for AR-15/M4 platforms, featuring a patented 3-setting adjustable recoil reduction mechanism that minimizes felt recoil by up to 50%. Mounts on Mil-Spec or Commercial carbine buffer tubes via interchangeable buffer tube adaptors, with an ergonomically shaped rubberized buttpad and an inverted positioning lever to prevent accidental opening. Works across multiple platforms and calibers for improved accuracy and reduced shooter fatigue. Safety note Follow all manufacturer installation instructions. Verify proper function and secure mounting before use. Comply with local firearm laws and regulations.