You will have to give more information than just the serial number to get an answer. Try describing the gun give the model number and who makes it. Just the serial number is of no use.
No. BB guns, pellet guns, blank guns, or realistic replicas of a gun are not permitted as a"carry on" item, and cannot be taken through a security checkpoint. They CAN be carried in CHECKED baggage,...
Different countries have different views and laws on BB guns. Some of them consider BB guns a firearm some don't. I suggest you check with the embassy of that country first. Or better yet don't take...