User blog comment:Sentry 616/RWBY OC Weapons/@comment-3391158-20180508185548/@comment-26018514-20180509023421

I don't think that kind of hook would work... there'd need to be barbs(or a blade, but that would probably cut down on the capacity of the hook) on the outside to cut when fired, although if that happened it could damage the second barrel if inserted that far into the barrel.

That said... if the mechanism had some kind of alternate fire in the other barrel and the primary was like a detachable grapple that the alternate fire shot some kind of barbed spike/piton attached to the other end of the primary ammo... but that might need a far differently shaped weapon.