I believe the question reads "Are you the actual purchaser of this firearm?"
That means you're paying for it with your money to do with it what you want. If your buddy were to give you the cash for it and you filled out the paperwork and paid for it with his money, then walked outside and handed him the lower, that would be illegal.
It sounds like you want to give this to him as a gift and expect no reimbursement. It is perfectly legal (per federal law) to buy a firearm and give it to another person, that may legal own that firearm, as a gift. I don't know what the State laws are in Kansas. Another way some people do this to avoid any issues, is to take the person with them to the gun store. The end user then fills out the paperwork and takes possession of the firearm, but the gift giver pays the bill when all is said and done.
Must be a good friend to get a lower for his birthday. I need to reevaluate who my friends are.