Five ounces of topweight may restrict your options, but can still be made legal pretty easily.
Now HIGHER topweights might begin to be a problem, but since you are allowed a maximum of three ounces topweight after drilling, it shouldn't be too hard to get it there. Just drill it label and make the finger/thumb holes extra deep. If it is still over, just add a small hole on the label until it IS legal.
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Good transactions list in my profile
ILLEGITIMI, NON-CARBORUNDUM!