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James, no Sir. Without the choke installed the threads would be exposed and subject to damage Sir. The Cylinder Choke or Modified choke should be used with the Cylinder choke providing best accuracy for standard Foster Type Slugs. Cheers and stay safe!

James, Never shoot choke barrels without using choke tubes. Shooting without choke tubes is very dangerous as debris could be trapped by the threads and create barrel obstructions. It may also cause erratic shot pattern and can damage the barrel's internal thread irreparably.

You should not shoot slugs—or any other shot—through your barrel without a choke in place, since there is a very real possibility that you will damage the threading.