Arrows have been outclassed by bullets in terms of ranged weaponry, but how many digits fit on a bullet?

Besides, I’m not sure efficiency should be a goal in weaponry of any kind. I’d prefer the opposite, in fact. Is there a less-efficient ranged weapon than marshmallows?

Rules:
Normal Sudoku rules apply.
Digits along arrows sum to the value in the attached circle. Some arrows share cells, but no arrows cross other arrows.

Estimated difficulty: 2 out of 5

Solve on SudokuPad
Multi-Purpose Cells