Im fix to start a 300 Blackout pistol very soon. Going to run 7.5 to 10.5 inch barrel with .750 gas port,JP buffer, and Spikes Tatical lower. I am ONLY going to run suppressed= subsonic loads in this pistol. Here is my qestion. Does anyone kmow of a bolt carrier lighter that the 6oz JP low mass? I have concedered taking a Dpms M-16 bolt carrier= 7 oz and having it machined down= to take of oz of weight, but i dont know if it can be made light enough? So basicly if anyone has a sugestion on a ar-15 bolt carrier LIGHTER than 6 oz please responed?? Thanks