@ AnimePrince:
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This is the one that Paradise recommended.
@Shadow:
I, myself, didn't have to use an injector. Simply download the .rar and then extract them to your S4 league folder. After which, start up your S4 League patcher. And a pop-up should occur after step 10 of the HWC.
Step-by-step in-game (for me):
1. Go into whichever room you want to enter.
2. Click on inventory.
3. Set your limit in the open-text box. (I honestly have no idea what it means, so i just choose random numbers :p) Usually 150.
4. Press F10 to hide it. ( I think thats what it was <<')
5. Press F12 once its hidden and if a box pops up that say "Success", Then you've done it right :D!
6. Close inventory and start game.
7. Press "F" whenever u need that little bit of ammo boost :3