2.build the repeaters on the other side just like that then the and of it a dispenser
3.then put repeaters on the back of the other dispensers
4.then join the redstone to a lever
5.makesure you tick the repeaters that leads to the dispenser thats alone
THE TICKS V
6.finaly put 64 tnts inside each dispensers
THERE WE GO! THE RIFLE IS COMPLETE!