how to make a raider's TNT rifle :D

1.build a normal tnt cannon structure except theres dispenser along the sides just like the picture

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!