Yes they are ATF okay. Black powder and Fuse sends a cement filled beer can 400 yards! Unopened pop cans turn inside out. Lots of fun. These are made with all of the safety features required by the NSSA. Reduced powder chamber,OD= 3X the powder chamber, no sharp corners on the inside, 1018 steel, all machined, only the trunion bar is TIGed on to it. I built my first one and everyone has been begging for me to build one for them, so here is your chance. I am looking at building my AR15 Lower with parts kit into a carbine length 300 blackout. Or ask me if you got a trade in mind. The worst I will only say no thanks. I have made 3 of them 1 is ready now w/o the carriage. I need to order new parkerizing solution for the other 2 and will build carriages for them, but the cost will go up for the ones with the carriages.