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Can a player use the Craft skill to make an advanced firearm? And if so, would the crating cost be similar to other items? (50%)
The existence of advanced firearms is solely at the discretion of the GM, so this is up to them.
I believe the rule is "If advanced firearms exist, they can be created without a check using Gunsmithing... otherwise they don't exist." Of course, a persuasive casting of Lesser Wish might be able to get you a nice special gun from the future...
In his best Arnold Schwarzenegger voice, "Phase Plasma Rifle".