This is the world's most powerful pcp air rifle made by umarex usa with a power of no less than 980 Joules. The Umarex .50 Hammer The second photo shows the size of the calibre, next to it and 5.5 cal pellet. This is calibre .50 with a diameter of 12.7 mm. The hammer is 3.85 kg in weight This pcp rifle has two two-shot magazines. A bag with pellets and a filling nipple adaptor. Straight pull-speed bolt with a tension of 2 lbs Trigger pressure of 3 lb AR Magpul-style grip Integrated sling stud at the back Walther made 1:24 twist rifled barrel. Each shot regulated up to 3,000 PSI 24 cubic inch non-removable carbon fibre tank Built-in pressure gauge This is no toy. Lot will be packaged well and sent by registered mail.