01-27-2018, 03:45 AM
The Brownell, Toolcraft, Odin and Larue 6.5 Grendel bolts use a shorter tail which is .01 shorter than the Alexander Arms and most other Grendel bolts (Group Buy Bolt).
The Brownell, Toolcraft, Odin and Larue use shorter firing pins to prevent punctured primers. With the 6.5 Grendel bolt with .136 bolt face AA lengthened the tail of the bolt so a mil spec firing pin could be used. The first time the shorter bolt tail length first showed up was when Odin released their 6.5 Grendel bolts and 6.5 Grendel barrels. Odin’s were getting pierced primers which was traced to the mil spec firing pin in the shorter bolt. I suspect an engineer never thought to add .01 to the length of the bolt even though 5.56/223 use .125 bolt face +or- .001 and Grendel has a .136 bolt face.
I don’t think there is anything mechanically wrong with the Brownell, Toolcraft, Odin or Larue bolts but just a difference to be aware of incase you ruin a bolt. You just need to match your firing pin to your bolt, there is .01 difference in mil spec FP and the shorter firing pin.
The Brownell, Toolcraft, Odin and Larue use shorter firing pins to prevent punctured primers. With the 6.5 Grendel bolt with .136 bolt face AA lengthened the tail of the bolt so a mil spec firing pin could be used. The first time the shorter bolt tail length first showed up was when Odin released their 6.5 Grendel bolts and 6.5 Grendel barrels. Odin’s were getting pierced primers which was traced to the mil spec firing pin in the shorter bolt. I suspect an engineer never thought to add .01 to the length of the bolt even though 5.56/223 use .125 bolt face +or- .001 and Grendel has a .136 bolt face.
I don’t think there is anything mechanically wrong with the Brownell, Toolcraft, Odin or Larue bolts but just a difference to be aware of incase you ruin a bolt. You just need to match your firing pin to your bolt, there is .01 difference in mil spec FP and the shorter firing pin.