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The buffer tube from a carbine stock can be used, you just can't ever assemble the actual buttstock piece onto the buffer tube....that would be a federal offense. So, you're left buying a whole assembly and throwing away the stock to make uncle sam happy...
PSA makes a few short barrel rigs...but I think their shortest is 10.5 so I'd need to have it cut down...which is a PITA if the gas port isn't far enough back.
Honestly, out of a true pistol, 5.7 is really not that impressive. You can get far more penetration and cavitation out of a 9mm with much more readily available ammo.
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