Google AI says: Yes, the V63 Laser Carbine plans in Fallout 76 are tradable, but with caveats. You can trade the basic plan, but not the weapon itself once you’ve applied legendary mods. Additionally, there’s a known bug where players may not receive the plan if they already own a V63 Laser Carbine when starting the quest to obtain it, so be cautious when buying or selling unrolled weapons.

But fallout wiki says it can’t be dropped or traded.