For some of our more popular barrel sizes, we have glass bedded channel patterns. If your barrel happens to match one of these sizes, the fit will be more precise.

bulletStevens #2 ½ 1.025 straight, 8.5" or 10.63" long
bulletStevens #3 1.06 straight, 8.5" or 10.63" long
bulletStevens #4 1.135 straight, 8.5" or 10.63" long
bulletStevens #5  1.19 straight, 10.63" long
bulletStevens #6  1.25 straight, 10.63" long
bulletStevens #3  1.06 x 1.04, 10.63" long
bulletStevens #4  1.13 x 1.09, 10.63" long
bulletWinchester #3  1.06 x 1.04 with spring cut

Other standard octagon channels, but not in glassed format:

bulletStevens #1  About 7/8" straight only
bulletStevens #2  About 1" straight only
bulletWinchester #1, 2, 4, 5 octagon, #1, 3, 4 round

For other sizes, we will try to get the channel within .010", but some fitting by the customer may be required.