Nugentgl: GHK M4 Hop Up Unit Comparison
OptimusPrime
11 Sep 2016
A comprehensive video review by Nugentgl detailing the hop-up unit comparing the GHK Hop-Up Unit to the GBL and the TNT Hop-Up units for the GHK M4 Gas Blowback. He explains his testing methodology, and does the tests in terms of FPS and accuracy. Also included is a preliminary overview of the TNT hop-up unit.