We are the manufacturer of these cans. Custom made to your centerfire caliber or multi-caliber. Our centerfire cans are constructed completely out of stainless steel. The "tube" on out silencers start from a solid piece of barstock not tubing threaded to fit a rear cap, and are full auto rated. See the cut out example in the photos of the one piece and thickened blast chamber area. You will also need to specify desired thread pitch. Common sizes are 1/2x28 or 5/8x24, but we can custom thread them to your specific need. If you are a Missouri resident, we can handle all of the transfer process in person, or it will need to transfer on a Form 3 to your NFA dealer to handle the taxes and transfer forms to you. Dealer pricing available on multiple units as well.