How to tell "good" and "bad" hop-up rubber?
I know the combination of hop-up rubber, spacers and other things will change the performance of the hop-up, but if we assume all other factors are the same, is there a way to tell if an hop-up rubber is good, worth using, or not good? (other than the brand)
Is it possible compare 2 different hop-up rubbers without swap them back and forth and shooting to compare the grouping? Is it even possible to tell good or bad on one hop-up rubber without comparison? How do you tell if the stock hop-up rubber in a new gun is OK to use, or need to be replaced once you get it?
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