How do I make a (relatively) simple reloading system?

Hello! I'm getting started on a new vertical shooter, and I'm trying to start with a simple ammo/reloading system for the game's first weapon.

I have 2 variables, 1 for 'ammo' and 1 for 'rounds', in which the gun comes with three 'rounds' each with 8 'ammo.'

I have the events set up so that when 'ammo' reaches zero, we subtract 1 from 'rounds.' but for some reason i'm getting a logic error and this is not happening! if anyone could help i would greatly appreciate it! thanks

Here is the .caproj https://drive.google.com/open?id=1564PB2Nyj_8ngzwuGdSHS2Q4bWW_wgk-

Hello,

I edit your capx file and I hope that you find the solution.

You can download it from HERE.

If this does not solve your problem or you need any help to understand the events and conditions, please let me know.

Wow thanks! Your code looks much simpler than mine - I tend to use the 'trigger once' event too quickly, often forgetting that sometimes it's not necessary. thanks again