This part allow your to run air through the rear of your FIRST STRIKE (Tiberius Arms) T8.1 and FSC Pistols. Works on T8.1 pistols with a serial number 2000 and up and all FSCs.
Works like a dream. Pros: Easy to install (took me 10 minutes, look for Tiberius YouTube channel). Gases up immediately. Doesn't leak at all. Very consistent. Cons: Didn't completely line up with the back of my 8.1. We're talking millimeters here but I did expect it to line up flush on the side with the velocity adjuster screw.