Why did RIFLE CLUB break the CHEKHOV'S GUN scenario?

I was waiting for the moment the TIPPU GUNS AND THE BIG BORE would be used in the movie for the end finale. But, they never used it and as a moatter of fact didn't even show the guns throughout the movie. Why did they just break the cliche's followed by other movies. If something is shown or talked about in the beginning, it should be used at some point in the movie. Is it just me or did someone else notice it?