Issue #31637: Alien Blaster Long Barrel Glow mismatch
The Alien Blaster Long Barrel shown in the loading screen has a blue glowing middle rod
The ingame model does not:
See https://fallout.fandom.com/wiki/Alien_blaster_pistol#Gallery for bigger images.
The glowing rod matches well with how the tip looks on the short barrel,
so changing the ingame model of the long barrel would be my preferred way to resolve the mismatch.
There is a mod on the Nexus, that does just that; sadly, no permissions are granted: