By labelling it a "high-powered firearm", you are categorising it as a firearm (correct), and quantifying it WITHIN THAT CATEGORY as high-powered (incorrect).
You can't justify the "high-powered" label by comparing it to an air rifle, because air rifles aren't firearms. The "high-powered" label needs to be relative to other things in the same category.
It's like calling a Corolla a "high-performance car" by comparing it to a pushbike.
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