I don't know if there is a revolver with hop up...haven't seen one yet. Some people have made a fixed hop up, and I think the new 715 Wesson has one, but certainly not a mainstream thing. As for maintenance, every pistol needs maintenance. The revolvers aren't as finicky as the GBB's, but they still need to be kept clean and lubed to work properly when you need them to. Because CO2 loves drying out seals and rings, periodic lube with silicone oil will keep them from cracking from the drying and also the freezing effect of the CO2.
The barrel length will make a huge difference in the accuracy of the pistol because of the lack of hop up. The longer barrels are way more accurate. Although the 8" barrel is cumbersome to handle, it's outdoor accuracy is terrific. Then again, a solid GBB with a good hop up will shoot as far. Depends what you like...
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