People have been bankrupted after getting an approval letter and then manufacturing, only to be told the gun is illegal and all must be destroyed at manufacturers’ expense. End the BATFE.
In other cases, the ATF has rescinded letter rulings and caused problems for those who had begun production or sales based on approvals. Contradictory rulings have cost gun manufacturers and dealers hundreds of thousands of dollars in spent and anticipated revenue.
It's the same reason Clinton banned cheap Norinco ammo. Make owning guns costly.