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This simple but powerful manual dispenser-based cannon only has 1 power source - the lever. Flip it to "powered" state to release the charge. Flip it once more to release the shell.

Pros: Very simple and powerful.

Cons: Expensive dispensers, slightly tricky to efficiently use.

The technical name for it is 216.0MM3 dispenser:

  • 2 (overlapping) rows of TNT
  • 1 shell
  • 6 charge TNT total, 2 rows of 3
    • .0 - no condensation.
  • M - manual cannon.
  • M3 - slab mounting block.
  • Special:
Lever Cannon (front view)
Lever Cannon (top view)

Also, you can add a comparator and a hopper for manual setup. But you'll want to compensate the extra tick of the comparator by adding a repeater on the other side. The darker blocks are 2 high:

A
Lever Cannon (adjustable)

The measure of hopper A is subtracted from 15. The output will be 0-3, depending on the amount of items in hopper A.

Hopper A must contain at most 3 full stacks (or non-stackable items) and 60 items for the adjustable row to work on full strength. Each additional 23rd item will turn off a dispenser sequentially, beginning from the front. See also Redstone_Comparator#Measure_block_state for the exact values.

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