I contacted Brownells technical and discussed the 2.800 inch bolt and firing pin lengths. The technician I spoke was unaware of the 6.5 Grendel bolt overall length from the tail to the face of the lugs being 2.8100 plus or minus .001. I explained how AR-15 5.56/223 bolts measured 2.800 and used firing pins of approximately 3.279-3.280 or shorter within -.009 inches tolerance. The specification for firing pin protrusion is .028 to .036 inches or .008 inch tolerance in variation of bolt or firing pin length. Alexander Arms added .01 inch length to the 6.5 Grendel bolt to account for the .136 bolt face depth compared to the 5.56/223 bolt face depth of .125 inch. This permitted the use of standard milspec firing pins in the 6.5 Grendel. Brownells said they do not sell shorter firing pins for their 6.5 Grendel bolt/BCG.
I suspect the manufacturer of the Brownells 6.5 Grendel BCG uses a firing pin protrusion gauge to test their FP protrusion. If you dont have a firing pin protrusion gauge you can kind of do a work around. Add 2.800 bolt to 3.269 inch length firing pin equals 6.068. Add your bolt 2.793 plus FP length 3.265 equals 6.058. There is .008 tolerance in firing pin protrusion and I suspect your firing pin has excessive protrusion by .002.
Without having a firing pin protrusion gauge you really wont be 100% sure. Whether .002 will create problem I cant say. I wish Brownells used 2.810 length bolts but they dont. You could remove .002 inches from the firing pin tip or you could call Brownells who will try to resolve this issue. Id be surprised if you have a firing pin shorter than 3.265 inches. I compared my eight AR-15 firing pins and my shortest FP was 3.274 and my longest was 3.280 inches. From my research there is more emphasis on firing pin protrusion and being within tolerance for bolt length and bolt face depth. My three 5.56/223 bolts overall length were 2.798, 2.7965 and 2.799. All my AR-15 BCG and FP are in spec.
My major concern is someone mixing their firing pins between different AR-15 firearms. A person could easily have an in-spec BCG but by switching FP have an out of spec BCG. The problem is compounded by the 2.800 6.5 Grendel length bolt.
https://www.brownells.com/gunsmith-tools...26477.aspx
You could buy a Monster bolt and firing pin to use in Brownells carrier and keep the Brownells bolt for a spare. You could buy a stainless steel firing pin and shorten it to be in spec with the Brownells bolt. You could also shorten your brownells firing pin but it might be chrome plated thereby going through the plating. I wouldnt buy a Wilson Combat (WC) BCG at $225 but Im to cheap.
The latest Toolcraft 6.5 Grendel BCG have been in-spec. You could return your out of spec Brownells BCG and buy a Toolcraft or other BCG. Ive bought PSA Premium 5.56/223 BCG saved the 5.56 bolt and used Monster bolt in a couple of my 6.5 Grendel builds. I try to keep at least one or two spare AR-15 bolts, whether 5.56 or 6.5 Grendel.
Really depends on what you want to do. If it were me I would call Brownells and explain their liable to get sued if they ever get a slam fire with one of their out of spec BCG and someone gets hurt. Id also explain to them AGAIN why they need to wise up and use 2.810 length 6.5 Grendel bolt.
I suspect the manufacturer of the Brownells 6.5 Grendel BCG uses a firing pin protrusion gauge to test their FP protrusion. If you dont have a firing pin protrusion gauge you can kind of do a work around. Add 2.800 bolt to 3.269 inch length firing pin equals 6.068. Add your bolt 2.793 plus FP length 3.265 equals 6.058. There is .008 tolerance in firing pin protrusion and I suspect your firing pin has excessive protrusion by .002.
Without having a firing pin protrusion gauge you really wont be 100% sure. Whether .002 will create problem I cant say. I wish Brownells used 2.810 length bolts but they dont. You could remove .002 inches from the firing pin tip or you could call Brownells who will try to resolve this issue. Id be surprised if you have a firing pin shorter than 3.265 inches. I compared my eight AR-15 firing pins and my shortest FP was 3.274 and my longest was 3.280 inches. From my research there is more emphasis on firing pin protrusion and being within tolerance for bolt length and bolt face depth. My three 5.56/223 bolts overall length were 2.798, 2.7965 and 2.799. All my AR-15 BCG and FP are in spec.
My major concern is someone mixing their firing pins between different AR-15 firearms. A person could easily have an in-spec BCG but by switching FP have an out of spec BCG. The problem is compounded by the 2.800 6.5 Grendel length bolt.
https://www.brownells.com/gunsmith-tools...26477.aspx
You could buy a Monster bolt and firing pin to use in Brownells carrier and keep the Brownells bolt for a spare. You could buy a stainless steel firing pin and shorten it to be in spec with the Brownells bolt. You could also shorten your brownells firing pin but it might be chrome plated thereby going through the plating. I wouldnt buy a Wilson Combat (WC) BCG at $225 but Im to cheap.
The latest Toolcraft 6.5 Grendel BCG have been in-spec. You could return your out of spec Brownells BCG and buy a Toolcraft or other BCG. Ive bought PSA Premium 5.56/223 BCG saved the 5.56 bolt and used Monster bolt in a couple of my 6.5 Grendel builds. I try to keep at least one or two spare AR-15 bolts, whether 5.56 or 6.5 Grendel.
Really depends on what you want to do. If it were me I would call Brownells and explain their liable to get sued if they ever get a slam fire with one of their out of spec BCG and someone gets hurt. Id also explain to them AGAIN why they need to wise up and use 2.810 length 6.5 Grendel bolt.