Why?
Why do you need something out front to grasp?
Why do you feel the need for an 8" barrel?
(With normal pistol ammo, you can expect lower velocities, as the charges are optimized for 5" barrels.)
And even with the "Potato" grip, you may run afoul of ATFE - I don't recall the exact wording of the law, as to if it says vertical grip or forward grip.
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Sleuth
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