Lock requirement for PPT shotgun?

[smith48]

I bought a used shotgun from a dealer last summer and my gun safe info was sufficient for pickup. I'm now doing a private party transfer for a shotgun and this other dealer says it's changed and I have to purchase a lock for every firearm I pickup regardless of the number of locks/safes I already have and bring with me when I pick it up. I found a vauge reference on the web for a federal law that now supposedly is responsible for making this the case.
Is the requirement still only that it leaves the purchase/transaction place with a lock from somewhere? Is this gunshop misinformed or perhaps just trying to make an extra sale?
Any clear info will be appreciated. Thanks!

[Mssr. Eleganté]

The dealer is confused about the gun lock requirements of the federal "Protection of Lawful Commerce In Arms" Act. That law requires that FFL's provide a gun lock with each modern handgun that they transfer to a non-licensee. There is no "gun safe" exemption to this law like there is with California law. But it only applies to handguns (C&R handguns are exempted).