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What firing pin do you have & why?
I heard the 5.56 pins are longer which strike the primers a lil deeper.
I also heard the same for the 7.62x39 but, I also heard the grendel pins work just fine.
Is titanium better to justify the cost? thoughts...
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Paul Peloquin
Did government credibility die of Covid or with Covid?
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A couple 6.5 Grendel manufactured bolts/BCG use a shorter firing pin. The reason is because Bill Alexander used .136 bolt face depth. A standard AR-15 5.56/223 bolt face depth is .125 and the bolt length is 2.800. Bill A. lengthened the 6.5 Grendel bolt to 2.8100 to permit the use of the same length firing pins as AR-15s in 5.56/223.
When Odin Works released their 6.5 Grendel BCG they used .136 bolt face depth. Odin kept the same bolt length at 2.800. Odin Works barrels started getting reports of pierced primers which was traced to excessive firing pin protrusion. The spec for firing pin protrusion on an AR-15 is minimum .028 to maximum .036. It was discovered Brownells BCG use the .280 length bolt but use a shorter firing pin. Odin last reported uses a shorter firing pin. Early Toolcraft 6.5 Grendel bolts were reported to be 2.800 length but Toolcraft supposedly switched to 2.8100 length bolts.
The AR-15 spec for AR-15 firing pin length is 3.280 with a tolerance of -.009. I wouldnt run a firing pin longer than 3.269 long with a 2.800 length bolt. There could be other 6.5 Grendel bolts manufactured with a length of 2.800. I would not mix up my firing pins in an AR-15 as you can get into tolerance stacking. You cant assume any AR-15 firing pin will automatically fit every 6.5 Grendel AR-15. There is normally a tolerance of + or - .002 or more in AR-15 parts.
If I needed to shorten an AR-15 firing pin I would buy a Stainless Steel firing pin over a chrome lined CMV steel firing pin.
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I shouldve checked the link but it is basically the same info.
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VASCAR2 Wrote:A couple 6.5 Grendel manufactured bolts/BCG use a shorter firing pin. The reason is because Bill Alexander used .136 bolt face depth. A standard AR-15 5.56/223 bolt face depth is .125 and the bolt length is 2.800. Bill A. lengthened the 6.5 Grendel bolt to 2.8100 to permit the use of the same length firing pins as AR-15s in 5.56/223.
When Odin Works released their 6.5 Grendel BCG they used .136 bolt face depth. Odin kept the same bolt length at 2.800. Odin Works barrels started getting reports of pierced primers which was traced to excessive firing pin protrusion. The spec for firing pin protrusion on an AR-15 is minimum .028 to maximum .036. It was discovered Brownells BCG use the .280 length bolt but use a shorter firing pin. Odin last reported uses a shorter firing pin. Early Toolcraft 6.5 Grendel bolts were reported to be 2.800 length but Toolcraft supposedly switched to 2.8100 length bolts.
The AR-15 spec for AR-15 firing pin length is 3.280 with a tolerance of -.009. I wouldnt run a firing pin longer than 3.269 long with a 2.800 length bolt. There could be other 6.5 Grendel bolts manufactured with a length of 2.800. I would not mix up my firing pins in an AR-15 as you can get into tolerance stacking. You cant assume any AR-15 firing pin will automatically fit every 6.5 Grendel AR-15. There is normally a tolerance of + or - .002 or more in AR-15 parts.
If I needed to shorten an AR-15 firing pin I would buy a Stainless Steel firing pin over a chrome lined CMV steel firing pin.
Very neat thanks.
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Brownells has got 6.5 Grendel firing pins in stock and I suspect these are the shorter length to accommodate the 2.800 length 6.5/ Grendel bolt. There was a question as to this firing pin link but I think the length was misprinted. I think the length should be 3.268 and not 3.368 as printed. If 3.268 is correct then that is what is needed with a 2.800 length bolt.
I contacted Brownells Technical staff after it was discovered Brownells was selling 2.800 length bolts and explained the potential for pierced primers. Brownells Tech stated he was not aware of this issue. Later Brownells listed a shorter firing pin for sale.
https://www.brownells.com/gun-parts/rifl...iring-pin/
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VASCAR2 Wrote:Brownells has got 6.5 Grendel firing pins in stock and I suspect these are the shorter length to accommodate the 2.800 length 6.5/ Grendel bolt. There was a question as to this firing pin link but I think the length was misprinted. I think the length should be 3.268 and not 3.368 as printed. If 3.268 is correct then that is what is needed with a 2.800 length bolt.
I contacted Brownells Technical staff after it was discovered Brownells was selling 2.800 length bolts and explained the potential for pierced primers. Brownells Tech stated he was not aware of this issue. Later Brownells listed a shorter firing pin for sale.
https://www.brownells.com/gun-parts/rifl...iring-pin/
I like how you werte able to find the specs coz when I go thur its just pics LMAO...
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Im basically summarizing what has been learned and discussed on this form. I measured all my AR-15 bolts and firing pins to verify everything is within spec. All my AR-15s have been purchased and assembled by me as I havent purchased a complete AR-15 rifle.
My intent is to keep shooters from being hurt or having damaged firearms. When you move to other calibers/cartridges in the AR-15 there is less standardization compared to 5.56/223. I just saved all this information in the event this topic comes up on forums.
There is quite a knowledge base of members on this forum and I have learned a lot but Im just a firearms enthusiast and retired LEO.
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VASCAR2 Wrote:Im basically summarizing what has been learned and discussed on this form. I measured all my AR-15 bolts and firing pins to verify everything is within spec. All my AR-15s have been purchased and assembled by me as I havent purchased a complete AR-15 rifle.
My intent is to keep shooters from being hurt or having damaged firearms. When you move to other calibers/cartridges in the AR-15 there is less standardization compared to 5.56/223. I just saved all this information in the event this topic comes up on forums.
There is quite a knowledge base of members on this forum and I have learned a lot but Im just a firearms enthusiast and retired LEO.
That's what I am here for too... one might say I am a part of the #meetoo movement
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12-17-2023, 03:04 PM
(This post was last modified: 12-17-2023, 03:10 PM by Firestarter123.)
Faxon confirmed that they use a 2.800 long bolt as well the other day.
ETA: Ive spent a lot of time on here the last week learning after buying a couple of 12 barrels from Faxon on a whim the other day when I saw they were on sale. I am just waiting on bolts from Maxim, a couple of magazines, gas blocks, and some ammo in order to try mine out. I need to get dies, brass, and bullets at some point too.
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12-17-2023, 04:06 PM
(This post was last modified: 12-17-2023, 07:43 PM by biodsl.)
Firestarter123 Wrote:Faxon confirmed that they use a 2.800 long bolt as well the other day.
ETA: Ive spent a lot of time on here the last week learning after buying a couple of 12 barrels from Faxon on a whim the other day when I saw they were on sale. I am just waiting on bolts from Maxim, a couple of magazines, gas blocks, and some ammo in order to try mine out. I need to get dies, brass, and bullets at some point too.
Welcome to the Forum. I had to laugh. We joke that this cartridge is addictive and they seem to multiply. It's difficult to own just one. You bypassed all that and bought two right off the git-go!
Paul Peloquin
Did government credibility die of Covid or with Covid?
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Firestarter123 Wrote:Faxon confirmed that they use a 2.800 long bolt as well the other day.
ETA: Ive spent a lot of time on here the last week learning after buying a couple of 12 barrels from Faxon on a whim the other day when I saw they were on sale. I am just waiting on bolts from Maxim, a couple of magazines, gas blocks, and some ammo in order to try mine out. I need to get dies, brass, and bullets at some point too.
Sweet I wanted to get a Faxon 18" heavy fluted. U should put them thru the fit & finish tests and borescope them before you start laying lead. I ran into some real problems from a manufacturer that has a name simmiliar to the planet that has rings just spelt differently and their customer service SUX.
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biodsl Wrote:Welcome to the Forum. I had to laugh. We joke that this cartridge is addictive and they seem to multiply. It's difficult to own just one. You bypassed all that and bought two right off the git-go!
Thanks!
Go big or go home, right
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Steve_evetS Wrote:Sweet I wanted to get a Faxon 18" heavy fluted. U should put them thru the fit & finish tests and borescope them before you start laying lead. I ran into some real problems from a manufacturer that has a name simmiliar to the planet that has rings just spelt differently and their customer service SUX.
Thats not good considering the cost of their barrels.
Fit and finish is excellent on these barrels. One of the bores was rather dirty but it cleaned up nicely. I should really buy a borescope but I dont have one currently.
