The best thing I have found to do when purchasing off of here is my own rule of thumb and it works as good as using a FFL. From a buyer's standpoint I always do my very best to go the next morning (since I work Midnight shift) on my way home and purchase the USPS MO and as they are filling it out I always take a pic of the addressed envelope, tracking number and receipt and make sure to text those 3 pics to whomever I am making the purchase from. If its going to be over a weekend before I can make it to the Post Office I establish means of communication with the seller and keep them informed of my activities up until I send them the pics. I know it sounds "over the top" when it comes to buying but I value my word highly and I am not going to do anything to jeopardize my or my word's integrity. Just my 2 cents. Upfront and honesty have always worked best for me.