lesson learned, i bought a harris type bipod from ebay recently to mount on an air rifle. i know the bipod was an imitation of the harris swivel bipod and i expected to get what i paid for which was $60 from hong kong. Within five minutes of mounting on the rifle the bipod broke at the joint between the swivel barrel and the foreend mount. the best the seller will do is offer a $10 credit for more sub standard kit. in the end the decision is yours but i would warn you not to purchase one of these bipods from woofeiwing via ebay, it could put the dampers on a days hunting.