I have 2 sterlings... The first is a stp2007, with a freak back, a Deadlywind front and a max flow (375psi for +/-285fps). My second is a sterling thread body with stp2007 parts... The sterling thread body is a real closed-bolt, against the stp2007 with spyder thread who have +/- .68 between the barrel and the bolt... But, to find a freak'd barrel for my second sterling....... Please Mike, work to make a freak'd barrel for our sterling... Like that, i can make my best competition sterling.