^exactly that.
even the modify baton rubber with the bridge (save a bit of money cause you can get both from airsoft parts.)
I use both the promy purple bucking and bridge and the modify smooth with the bridge. Great improvement, the rubber last pretty good but they are cheap to replace as well and really if your handy you can shave the centering ridge off and rotate it when it's worn.
http://www.airsoftparts.ca/store2/in...ort=20a&page=2
both items on that page and the modify comes in hard and soft (soft likely for your setup) the modify works okay on its own but the flat tensioner doesn't fill the whole hop window on some guns. The promy tensioners fill the window on a v2 and v3 hop up and has a chart for trimming to fit other hop ups.