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It's a very nice hopup rubber. I've teflon taped mine to avoid air leakage, and it's extremely consistent- I remember back when I didn't know any better, the WE rubber was giving me 10" groupings at 45 feet, which was laughable compared to the 2" I'm getting now. It is the VSR-10 type. I've been looking forward to trying another rubber eventually, but this one works well for now.
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