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Then open the DF-480M on the workbench, and again use the selection tool, which should now have your preferred weapon in it to move the weapon underneath one of the two pylons. (Use the arrows to move the selection). Once the weapon is correctly aligned (the hardpoint connector on the weapon should connect to the hardpoint body on the pylon) press Ctrl+V to paste the weapon. That's it, you don't have to merge them. Then repeat everything for the other weapon you want to use.
If you spawn the helicopter and the weapons fall down the hardpoints are not aligned properly.