Neo035 talks about the upgrades done to the Ares Airsoft Mauser 98k rifle. This uses the TNT Studio Ares Kar98k Retrofit Kit which comes with a one piece CNC'd aluminium hop chamber base as well has aluminium front cover, aluminium BB stopper,  and aluminum lever *1 , 6*6 nub*1 , PIN*1. This also includes a 60° H.L.R. Rubber for the ARES 98K and T-N.T. S+ inner barrel with a 545mm length.