Technically there is no definition an "a cat firearm"
There are definitions of what is NOT an a cat firearm, e.g. the relevant one
pistol means a firearm (other than a prohibited firearm or restricted weapon) that is designed or adapted to be held and fired with 1 hand, and includes any firearm (other than a prohibited firearm or restricted weapon) that is less than 762 millimetres in length
any interpretation beyond that is down to jurisprudence and precedent
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