It is the one on the left with the 2 different color screws and a little wider than 3/4 inch. I do not remember which clamp I put in the milling machine vice but I turned the other with the auto wrench in the photo. The 1/8 pin on the clamp was put up against the magazine box to insure the clamp did not slip and mark the action. Was not necessary in this case as the barrel was not real tight. The bushing on the right was used to bush for holding the finished barrel. I bored it out after the first use then needed to bush it to finish. The clamp in the middle was used on the barrel.
![Image](https://kragcollectorsassociation.org/kca/phpBB3/images/yabbfiles/Attachments/KragBarrelToolsrs_001.jpg)