I have had many shotguns apart and have never had one frozen. The hole on top of the trigger guard that your refuring to is a through hole. fill it with penatrating oil and let it soak. Instead of useing kroll oil use some Break Free. One of the best penatrating oils I have ever used. Be carfull I have seen lots of broken trigger guards. The trigger guard is right hand thread so turn it counter clock wise. You probable already know that.
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