I've RIA drawings specifing barrel markings on a completely new USGI rifle and that marking is not licensed. If I am using a non-nfa class 3 reciever, could I set in a very "fake" sear pin on my retro build or would I be tempting fate? Not only was the https://dantehaldk.illawiki.com/1108346/colt_m16a1_for_sale_things_to_know_before_you_buy