Description If you have a barrel already or can find one fast use this link to get a chamber service- https://straightjacketarmory.com/product/prefit-chamber-and-thread-service/ Bull Sporter: 1.200, 2.750, 6.000, 1.000, 26″ : .750 Rem. Varmint/Sendro: 1.250, 2.000, 4.350, .950 26″ : .830 M24/M40: 1.200, 3.000, .900 Need Help Installing Your New Bartlein Carbon fiber Pre-Fit Barrels? After you receive your one of a kind Bartlein Carbon fiber Pre-Fit Barrel from Straight Jacket Armory you might need some help installing it. We’re here to answer your questions and to start with some tips check out this video How to install a pre-fit barrel
