Seller: scfrekh (350) 100%, Location: Farmingville, New York, Ships to: US, Item: 281131360495 45-70 barrel insert used just under 21" long. This drops into a 12 ga break action and converts that barrel to 45-70. Shell is extracted by a built in extractor that used the shotguns extractor. Bore is good. The face has been filed and fitted to fit my sxs that has since been sold. This was originally for a Baikal sxs 12 ga coach gun and had adapters that threaded into the muzzle to lock it in place. I used it in a different gun with longer barrels and stabilized the end using O-rings. Can also be cut to desired length. Made of steel. Surprisingly accurate. I used it with 45-70 handloads using 45 cal muzzleloading sabots and 357 mag pistol bullets. Shot awesome. Ships to lower 48 and Alaska only. Thanks for lookingOn Jul-10-13 at 17:18:16 PDT, seller added the following information: Just to be clear since there has been some questions, I do not have the threaded nuts for the adapter, just the adapter as shown and described in the auction description.