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Yeah, the Firefly isn't a bad hop up rubber. In fact, I have it installed in quite a few of my pistols, bolt action, and AEG's and I think they're absolutely fantastic. They're very very accurate and very durable. I like the PDI ones more, only because they yield a slightly higher FPS along with the dual nub feature, plus the nitrile construction makes it more resistant to chemicals found in some oils and greases. They're still fairly new, so there's no long term results yet, but I'm liking what I see, especially at that price.
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