Yes. Compliance with federal background check provisions does not excuse a licensee from compliance with state law, and vice versa. Licensees must follow state law waiting periods.
State X is acting as a point of contact for NICS checks. State law requires the licensee to wait 10 days, rather than 3 days, for a response to the background check prior to transferring a firearm.
Because state law provides a 10 day period before a licensee may transfer a firearm, the licensee may not transfer the firearm until 10 days have elapsed since conducting the background check.
State X is acting as a point of contact for NICS checks. State law allows a licensee to transfer a firearm 24 hours after conducting a NICS check and receiving a “delayed” response.
However, the licensee must comply with federal law which requires the licensee wait 3 business days prior to transferring a firearm, if the licensee has not received notice that the transfer would be prohibited.
The law of State X provides for a 5 day waiting period before a handgun may be transferred by a licensee. An individual completes an ATF Form 4473 for the purchase of a handgun, a NICS check is conducted, and a “proceed” response is given by NICS.
Although the licensee received a “proceed” response, the licensee must comply with the state waiting period, and the licensee may not transfer the firearm until the state's 5 day waiting period has elapsed.
[18 U.S.C. 922(b)(2)]