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The Fireflies have a double nub bucking, which none of those other mentioned hop up rubbers have.
The only other hop up rubber I can recommend over the Firefly hop up rubber, is the PDI W-Hold. They're a bit more durable, and they perform a bit better... and best of all, they're cheaper. I've been trying to get my hands on more, but they've been sold out at all of my distributors.
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