PewClub Entertainment does a field test of the T.N.T The One Retro fit hop-up chamber... "In this video, we field test the TNT “The One” Retrofit Kit Hop-Up Chamber, installed on the Tokyo Marui Hi-Capa, ASG CZ P-09, and Double Eagle Noveske N4 airsoft replicas. The results were excellent — improved accuracy, stability, and overall performance. This is a highly recommended upgrade for serious airsoft players.