a bucking won't help with range as much as it will groupings. For pretty good range and accuracy:
-quality barrel (your madbull is fine)
-bucking to match your fps
-custom nub, or r-hop, of flat hop mod. Whatever you want to do
-complete seal for leaks
-polish inner barrel
-stabilize inner barrel
-shim hop up arm if needed
-use heavier bb's (.28+)
Most people think "Oh i want super range and accuracy, so i will buy a 550mm 6.01 tbb," which is an awful idea. You need to make sure your cylinder and barrel volume match. On top of that, 6.03's are more accurate past 100 feet compared to 6.01's. You can get good results from stock parts and small tweaks.