One last thing, while I am a huge fan of Memphis BBQ and prefer it overall to any of the rest; the single best BBQ I've ever had was at Aaron Franklin's place in Austin.
Luckily, he has all of his recipes and step-by-step cooking instructions on youtube:
Just to be clear the FFL is only needed when you purchase the rifles. You are the owner and what you do with them is not the business of the FFL.
After you take possession of the rifles you and your parents fill out the NJ COE for each rifle and you do not file this paperwork with anyone (not the ATF, NJSP, FFL, etc).
As jackandjill said make sure you are not receiving anything in exchange for the gift or your purchase of the rifles will be viewed as a straw purchase.
Pistols are very different. Your parents would need to provide you with a Permit to Purchase and you would have to file that with their local PD and the State Police.