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What the long range barrel does is it creates a little backspin on the bb so you do not need as much hopup and it also means the bb should be exiting the barrel in the exact spot each time.
In saying this I don't bother to use a LRB anymore. I use 6.01mm (or smaller) tight bore barrels and there is not much excess space. So the bb should exit in the same spot each time (or close enough). So, I would not bother. It can make your system fiddly.
If you do the LRB mod, test it first with no hop and see if the LRB can create some hop for you. It will not be able to create enough but if it can create a little then you should not need so much downforce from your nub.
In saying this I don't bother to use a LRB anymore. I use 6.01mm (or smaller) tight bore barrels and there is not much excess space. So the bb should exit in the same spot each time (or close enough). So, I would not bother. It can make your system fiddly.
If you do the LRB mod, test it first with no hop and see if the LRB can create some hop for you. It will not be able to create enough but if it can create a little then you should not need so much downforce from your nub.