You'll need to pay for Construct 3 to access what I was referring to,'Families'. you can put all your bullet objects in a family and call it one time for all. It's so you don't need to do repeat events for many objects. More info in the manual!
From your last response I see that you want to keep an angle for shooting until you change weapons so yeah a global variable is a good idea, as it is the equipped weapon rather than the bullet. You can also have the equipped weapon as the variable so if weapon ='weaponA' and shoot key is pressed then spawn bullets at a certain angle.