Chamber sleeves for small bore shotguns.
These are sub-caliber chamber sleeves. The one on the left is 28 gauge and takes 9mm Luger. The one on the right is .410 bore and takes .32 H&R Mag or .32 S&W Long. They are smooth bore; after exiting the sleeve the centerfire bullet freebores down the rest of the shotgun barrel. Not much good for any distance but makes your shotgun a little more versatile. And if somebody came to your house looking for a 9mm pistol as evidence and all they found was a 28 gauge shotgun, I guess they wouldn't have any evidence. Just f'rinstance.
These are sub-caliber chamber sleeves. The one on the left is 28 gauge and takes 9mm Luger. The one on the right is .410 bore and takes .32 H&R Mag or .32 S&W Long. They are smooth bore; after exiting the sleeve the centerfire bullet freebores down the rest of the shotgun barrel. Not much good for any distance but makes your shotgun a little more versatile. And if somebody came to your house looking for a 9mm pistol as evidence and all they found was a 28 gauge shotgun, I guess they wouldn't have any evidence. Just f'rinstance.