what he said.
they start becoming more and more helpful the closer you get to 25rps... and over 30rps it's almost a requirement.
They do help with sluggish feeding though, so it's advantageous if you have slower feeding mags or ammo.
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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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