This gun has a 6.01mm tightbore and metal 15T piston. Other than that, this gun is stock. This has been my primary recently as my M14 EBR is in the final stages of upgrades, my Tar is getting a new piston, and M4 is currently undergoing a major overhaul withPrime Customs. I can always count on this gun to hold its own on the field, and the compliments I receive are always nice, too.
Don't mind the horrendously cropped pictures. I'm at the level of a doorknob when it comes to photoshop/paint.