Hi, the guns from MrCrayfish are rotated on half under ground when ItemPhysic used, if i could set somehow vanillaRendering only for a list of item or change the angle, it would fix the issue, but i am too dumb and don't know java to be able to do this

Other mods can make their items use the vanilla rendering quite easily. All they need to do is to set the field skipPhysicRenderer in ItemEntity to true. There is also an option to change that behavior using the config. Use the command /cmdclientconfig -> itemphysic -> rendering -> vanillaRendered. There you can add items which rendering behavior should revert back to normal.