The bag rider will help you get a more solid shooting position by providing a stable and smooth surface to interface with a rear bag or other surface. It attaches to most chassis with bottom mounted picatinny rails on the buttstock.
 
The bag riders are printed with carbon fiber filament and use high-quality stainless-steel hardware. They are adjustable front to back, up and down (with included 8mm spacer), and can be flipped to utilize the flat or angled bottom section.