TRIDOS TDC Upgrade Kit FOR AAP-01Thumbscrew + Set screw Fine pitch threads CNC nub plate Comes with drill jig Compatible only with stock hop up chamber Included drill jig works only with original AAP 01 AAP 01C upper This TDC kit for AAP01 replaces the stock hop up adjustment mechanism with a screw that pushes down on a custom CNC nub plate. Compared to other TDC's on the market, our version uses fine pitch threads compared to standard M4 threads, which leads to 28% increase in