Yeah, i was in a gunshop that favored leo's a couple months ago. He had a display of MicroTech Automatic knives, but he put a sign up that said you must have a CCW to purchase. Well one of the leo's told him that, that was no longer true. A year or two ago, a senators son got caught with one, and instead of bringing it to public, he managed to get them legalized and help out his son. The store owner said wow, i didnt know that and threw the sign away. As long as your 18 you can buy one. Although they will sell cheap ones from China to you at 16 from a flea market.
Federal barrel length on a rifle is 16 inches. Some counties and cities have the ability to adopt waiting periods. West palm has a 5 day wait on rifles and handguns unless you havea CCW. Not sure about other places.
ETA: We dont need a concealed weapon permit to carry switch blades or stillettos.
If you had your mom buy the gun, with the purpose of giving it to you would that be a straw purcahse? Or does a straw purchase only matter if the one receiving the gun isnt allowed to legaly purchase one himself?