Back in the good old days when tennis balls came in pressurized metal cans, it was said they made good firearm silencers.

You supposedly could solder a clamp to the bottom of the can.

Drill out the clamp in the correct diameter for the barrel it would be mounted to.

Drill a hole througn the clamp through the bottom of the can.

Reinsert the tennis balls into the can.

Attach the plastic cover to the top of the can with duct tape in a manner that would hold the cap in place during firing.

After firing several rounds (The number of shots being dependent on the size of the cartridges.), you took the cover off, rotated the balls, reattached the cover and fired some more.

Mind you, this is all hearsay and I would never dream of showing any balls about this to the ATF.

You gotta love the American English language!

Bountyhunter