Yea people who cant help but brag to others and rat themselves out,post pictures,as long as you are not shooting on public land no one has a right to know anything,if its in the privacy of your own home or on your own land and your not building postbans as prebans and selling them as prebans, and you keep your mouth shut no one will know what you have,unless you are doing unlawful things to attract attention,unless theres proof I think americans are still protected under the 4th ammendment from illegal searches and seizures,My advice to people dont post pics of what you have anywhere,talk about it but keep your things private.To me I guess its easier because my rifles were bought when prebans were rifles that could no longer be imported so my now preban was not originally a 1600 dollar rifle,in a year people will be able to configure it the way they want to,I heard CMMG for instance now sells a 14.5 with a washer slightly longer so the A2 birdcage can be permanently attched,wish I knew that before the phantom wich is awesome but with a birdcage its the proper look.So how ever you assemble it keep it to yourself and if the SHTF no one is going to care pre or post what will matter is having a weapon that works,no one will try to check the serial# if they are on the receiving end especialy a criminal bent on shutting you down all he will know is he dosent want to get shot,theres an old union saying"out of sight..out of mind"cant get in trouble with something thats not seen or made public.Be a law abiding citizen and keep your buisness private,als for all we know it could be a preban lower and there is no law against a post ban upper being on a preban lower sometimes you can get a good deal on something even if its not the type of barrel you want so lets not jump the gun and accuse a fellow member of posting something illegal unless we know for sure,and the only one who does is the postee and thats his buisness he posted the picture,in other words he made his bed and hell lie in it its on him illegal or not its not me so im not going to get on someone else when I dont know for sure cause you cant tell unless some of you down loaded the picture and with a magnifying glass are trying to read the serial#,I worry abot things that concern me.