Air Venturi Avenger .177 Oring Kit Compatible with Avenger rifles and bullpups (all versions) Kit Includes: 2 - Pellet Probe Breech Seal Orings 4 - Air Cylinder Plug Orings (13x3mm) 2 - Air Cylinder Rear Plug Orings (12x2.5mm) 2 - Barrel Shroud Support Orings (19x1.5mm) 3 - Barrel Orings (8x1.5mm) 1 - Rear Shroud Support Oring (23x3mm) (For non-threaded shrouds) See full schematics for the products this part fits: Air Venturi Avenger, Regulated PCP Air Rifle