10-21-2013, 12:10 PM
Type 1 is .125 HS and Type II is .135 HS and both fit the diamiter of the Grendel, LBC .264 and Beowulf. For the Grendel and Beowulf it is a Type II. Some LBC's use both so you need to know what your original bolt was or the barrel was set up for which type.