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+--- Thread: Help!! Broken bolts! (/showthread.php?tid=5735)
Help!! Broken bolts! - dammitman - 02-12-2014
I thought that the barrel assembly was where a rifle was headspaced, not a bolt. That way you could replace the bolt without issues.
Help!! Broken bolts! - LRRPF52 - 02-12-2014
The barrel, barrel extension, and bolt all are factored in when headspacing an AR15 barrel. The bolts can't be fit so tightly since it's a gas gun, but there still are some maximum tolerances that can't be exceeded.
Help!! Broken bolts! - explorecaves - 02-12-2014
dammitman Wrote:I thought that the barrel assembly was where a rifle was headspaced, not a bolt. That way you could replace the bolt without issues.
Another way to think of it: The headspace of the bolt combined with the barrel extension will determine how deep the chamber has to be cut in the barrel to ensure a proper total headspace.
Help!! Broken bolts! - dammitman - 02-13-2014
explorecaves Wrote:Another way to think of it: The headspace of the bolt combined with the barrel extension will determine how deep the chamber has to be cut in the barrel to ensure a proper total headspace.
i get that for sure. but i just dont understand why there is ever ever a question of some kind of special headspacing a particular BOLT to a barrel. if a barrel is manufactured and it needs a bolt that i cannot just go order from LBC, maxim, precision firearms or from anyone who sells a 6.5 grendel replacement bolt i would want to know that so i dont buy that barrel. thus headspacing better be for any barrel with the designation 6.5 grendel for a what we call a replacement bolt.
Help!! Broken bolts! - explorecaves - 02-14-2014
dammitman Wrote:i get that for sure. but i just dont understand why there is ever ever a question of some kind of special headspacing a particular BOLT to a barrel. if a barrel is manufactured and it needs a bolt that i cannot just go order from LBC, maxim, precision firearms or from anyone who sells a 6.5 grendel replacement bolt i would want to know that so i dont buy that barrel. thus headspacing better be for any barrel with the designation 6.5 grendel for a what we call a replacement bolt.
Early on there was a manufacturer that modified 7.62x38 bolts to work for the grendel. These were set to 0.125" and are called Type I bolts. Type II bolts from the same company are actual grendel replacement bolts.
Help!! Broken bolts! - dammitman - 02-14-2014
I think that the type I is what they sent with my liberty barrel. Does anyone have a rifle that uses the type I bolt?
Help!! Broken bolts! - LRRPF52 - 02-14-2014
dammitman Wrote:I think that the type I is what they sent with my liberty barrel. Does anyone have a rifle that uses the type I bolt?
"Type I" is a Black Hole Weaponry internal term, and has no chronological bearing on the development of the Grendel.
I'm pretty sure Satern/Liberty has used .136" face depth bolts with the Liberty barrels.