The PX4 does have a 'de-sporterized' SMG variant now (MX4). We'll probably see some in films eventually, since they're so 'futuristic looking'. Classifying it is sort of the same situation as the HK94, but backwards.
The DeLisle was based on a SMLE, so I'd call it a rifle. Even if it fires .45ACP from a 1911 mag through a Tommy gun barrel.
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