Reply To: Marauder .22 barrel

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You might check the o-ring in the breech end of the barrel-if it’s missing or torn you might get air blowing out the breech which will wreck your velocity. Also, did you push any pellets through the bore and inspect to see if they were damaged? It’s not uncommon for there to be a burr in the transfer port hole which can deform pellets as they pass over it.