Since you are learning, let's keep things super simple so you don't get overwhelmed by code or math:
1. The Crosshair / Gun Fix (The Simple Trick)
If the gun isn't pointing at the crosshair, don't worry about complex muzzle alignment.
Open your Weapon Mesh or Character Skeleton.
Find the Socket where the gun attaches to the hand.
Use the rotation tool (E key) to manually rotate that socket until the gun points exactly where you want it. It’s like adjusting a flashlight in a character's hand—no code required!
2. Don't Rename Enums (The "Translator" Trick)
If my asset calls a slot 'Pistol' and your other framework calls it 'Weapon_Sidearm', do not delete or replace them.
Think of them as two different languages. Instead of rewriting everything, just use a Switch node in your blueprint.
When my asset says 'Pistol', plug that line directly into the other framework's 'Weapon_Sidearm' function.