To be fair they did use the design of the original sideshot mags, which was popular. When they was designed slug shooting was not as common among most owners, and probably worked fine for most pellet shooters. Now that they do sell slug liners, the mags should be designed to work for that purpose also. What FX maybe could do is to redesign there own inserts similiar to the custom made ones, and offer them for free as a retrofit to customers which already has troubles with slugs or pellets. I do not see getting a new mag on waranty of similiar type will fix the issue, as it seems to be the design itself that is the cause.
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