The BB gun used in the film is a Red Ryder as produced by Daisy. There is a reference to "pumping" 2 times, however, this is a simple weapon and can only be "pumped" one time.
When Tripp is eating with his friends, Tripp changes between having his fork in his hand, to nothing in his hand, to having a drink in his hand, back to nothing, without showing him switching items.