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ER hop is more for guns above 400fps in the states attempting to shoot higher than .36s. It's a bit of overkill for canadian guns, lot of work for little gain above the R hop at canadian fps levels. Ridiculously good results can be achieved with a standard sized IR hop patch, prommy barrel and excellent air seal mods.
R vs IR is normal material vs material more suited for colder weather, which is just some sort of silicone tubing.
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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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