GB, yep, that's why I blew up all the pictures in the catalog and looked first before I posted.
If you look closely it APPEARS that there is a shroud around the front of the cylinder covering the gap. Go to the catalog, look at the small picture labeled SA/DA and see if you see it too. Most obvious is the beefy forearm that's wider in diameter in front of the cylinder. I've fired the revolving shotgun and grenade launchers. They both used cylinder shrouds and a broom handle on the foregrip. Didn't even have to be told not to put my hand in front of the cylinder shooting the 10" S&W. I will of course wait and see, but if they've solved the problem as it appears they have, then I'll be a happy camper!