This is not really a defensible conservative position.
In any other aspect of life we recognize that increased regulation creating barriers to entry, even inefficient barriers, reduces that activity.
But supposedly when the issue is access to guns, any conceivable regulations are supposed to have ZERO impact on their availability and use in crime.
I will cheerfully agree that most proposed gun control regulations would be highly ineffective and severely intrusive on the civil rights of law-abiding citizens. For which reason, among others, they should not be implemented.
But that's very different from claiming that laws that make getting a gun more difficult will have no effect at all on the number of crimes committed with guns.
Reasonable gun laws are for reasonably stupid people.