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for an M4? where are you located? Just doing the barrel is kind of tricky because sometimes the bolt being closed will push the hopup unit off kilter and mess with the hop. Also how is your airseal? if you have a wide shot to shot variance rhop isn't so great (and neither is a standard hop). Also some weirdness can happen when installed into the hopup unit itself.. it will feel like a good install but the unit puts just enough pressure on it to overhop at 0 setting.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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