It was a Glock 26 or 27 in the very beginning. the rest of the movie it was a HK USP. I remember the kid pointing the gun at his father, when they were digging up the diamond. The safety lever was unmistakeable.
the kid pointing the gun at the end was a hk usp that he had re armed himself with at the camp before they left to go find the diamond.he had a glock 26 at the start and a hk usp at the end.I also wouldnt mind knowing what he had for the "middle" of the movie.The gun he bought from the bartender is the gun in question.
Remember in the movie when he told the bartender to get him a gun, he told him to get him a good one. I think it was a USP as well. Im not sure how good they are though since Im a P7 diehard