I have been trying to get this together for a while and as we all know parts are scarce , I still need a charging handle if anyone has one out there they would like to part with . I have no clue what kind of barrel it is there is no stamping what so ever on it , the FSB is machined and very very smooth , no cast flashing on it , it is a 12" heavy profile barrel , it had a 6" flash hider on it that looked ancient. The barrel is just snugged up as it is going to get bead blasted along with the FSB tomorrow so I can reparkerize it Monday because they had light surface rust and it bothers me . The feed ramps have no marks on them and no carbon in on or around the FSP. the only thing down the barrel was dust . lol . No marks from a BCG going into battery , Im going to say this one has probably never had a round through it if it has it was very little . Anyone know about that machined FSB ?