With G&G's Top Tech T4-18 now back in circulation and where the pneumatic blowback comes from, Epic Airsoft HD finally get to review this premium AEG... "We get our hands on G&G's version of the HK 416. The Top Tech TR418 has been around now for some time. This latest version 2 is a replica of the famous H&K AR-15 piston driven platform but how does this AEG version compare to the guns we reviewed in the past?"