Are you sure, that the air cylinder is 180cc? Brococks homepages says, that it is 150cc Concept-Lite Features include: Overall Length: 838mm/33″ Barrel: 431mm (17 inch) Choked Weight (unscoped): 6.5 lbs / 2.9 kg Calibres: .177 (4.5 mm), .22 (5.5 mm), (FAC only) .25 (6.35mm) Valve...