OEM Russian made by Molot full choke. Designed for Vepr 12 or Saiga 12 shotgun. Both ends are threaded for installation of muzzle brake or flash hider, works great with Molot GK-01 and Lynx Kamerton. Full choke - reduction 1.0 Improves group and accuracy up to 60-70% designed to be used with small and medium size pallets. Possible to use with special ammunition.