Hop rubber in a G&P M249

[bush tucker 75]

hi all. just ordered a G&P m249 ranger and a firefly hard nub and im after a range increase. the gun has to run around 350 fps and i use .25's. just wondered what peoples thoughts are on appropriate rubber to use. i'm thinking of using the original or a standard marui. any thoughts on this. thanks all

[bush tucker 75]

Re: Hop rubber in a G&P M249

right, the original nub, firefly hard and madbull x spacer don't seem to give a hard enough surface to apply enough back spin. anyone got any recommendations or shall i try the biro !!