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Posted: 11/11/2015 10:02:02 PM EDT
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I am writing a tech page to help newbies and other to understand or pick the parts for them ...
Here what I have so far and would like some input please. Bolt Carrier Group-aka BCG Bolt Metal 8620 steel This grade of steel is mostly reserved for the carrier and has the weakest strength of all the steels ..To most people this shouldn't be used for a bolt cause of strength reason and over all safety. 158 Carpenter Steel This steel for me is the absolute minimal that I would use for a bolt and the only steel that is MIL spec. 9310 Steel This supposedly a minor upgrade to the 158 Carp steel and AIM claims to have less breakage with this steel vs 158 Carp.. Coating Phosphate or Parkerizing This the most basic and common coating and considered MIL spec .. The coating can be a little rough and hide some flaws in the workmanship.. It may take a couple rounds to smooth it out .. Nitride This is not a coating but a process and it changes the outside steel like anodizing..The steel is now slicker and easier to clean with this process..Also cause it's not a coating the finished product must be a better cause the Nitride step will show every flaw or imperfection... Nickle Boron Coating This a coating applied to the metal similar to chrome ..This is the slickest coating of all and is easier to clean and supposedly can be ran without lube but I would still add lube cause it better to be safe than sorry later down the road..Remember though this a coating only and is really not needed to run a AR platform but does look nice but it cost more for it and use will have to decide if it worth it to him or not... Please be gentle |
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•HPT Bolt (High Pressure Tested/ Proof) •MPI Bolt (Magnetic Particle Inspected) •Shot Peened Bolt •Chrome Lined Carrier •Chrome Lined Gas Key •Gas Key Hardened to USGI Specifications •Grade 8 Hardened Fasteners •Key Staked Per Mil-Spec •Tool Steel Extractor •Black Extractor Insert •Mil-Spec Crane O-Ring |
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Is English your first language? You left out Aeromet and S7 for bolt materials. Aeromet is stronger than C158 or 9310. AFAIK it's only used in the LMT E-bolt. Bolt life is indefinite. S7 has been used by Sharps Rifle Co. They have had heat treat issues that led to broken bolts. Reportedly this steel has trouble in extremely low temperatures. |
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Quoted:
Is English your first language? You left out Aeromet and S7 for bolt materials. Aeromet is stronger than C158 or 9310. AFAIK it's only used in the LMT E-bolt. Bolt life is indefinite. S7 has been used by Sharps Rifle Co. They have had heat treat issues that led to broken bolts. Reportedly this steel has trouble in extremely low temperatures. Sorry I was half asleep and had my screaming daughter ... Ok and I am noob to this and looking for everyone helps for the best possible information... The Article will be for AR15.com So any input would be greatly appreciated |
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Quoted:
•HPT Bolt (High Pressure Tested/ Proof) •MPI Bolt (Magnetic Particle Inspected) •Shot Peened Bolt •Chrome Lined Carrier •Chrome Lined Gas Key •Gas Key Hardened to USGI Specifications •Grade 8 Hardened Fasteners •Key Staked Per Mil-Spec •Tool Steel Extractor •Black Extractor Insert •Mil-Spec Crane O-Ring Proper gas key bolt staking |
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Quoted:
Is English your first language? You left out Aeromet and S7 for bolt materials. Aeromet is stronger than C158 or 9310. AFAIK it's only used in the LMT E-bolt. Bolt life is indefinite. S7 has been used by Sharps Rifle Co. They have had heat treat issues that led to broken bolts. Reportedly this steel has trouble in extremely low temperatures. dont buy into hype, nothing lasts forever.. nothing. |
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Quoted: dont buy into hype, nothing lasts forever.. nothing. Quoted: Quoted: Is English your first language? You left out Aeromet and S7 for bolt materials. Aeromet is stronger than C158 or 9310. AFAIK it's only used in the LMT E-bolt. Bolt life is indefinite. S7 has been used by Sharps Rifle Co. They have had heat treat issues that led to broken bolts. Reportedly this steel has trouble in extremely low temperatures. dont buy into hype, nothing lasts forever.. nothing. When ammo costs .20+ each and life is 60,000+ rounds, it's pretty close. At that point your through multiple barrels on the same bolt. FWIW, I get along fine with C158 and 9310. Few of my rifles will burn a barrel out. |
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Quoted:
Sorry I was half asleep and had my screaming daughter ... Ok and I am noob to this and looking for everyone helps for the best possible information... The Article will be for AR15.com So any input would be greatly appreciated Quoted:
Quoted:
Is English your first language? You left out Aeromet and S7 for bolt materials. Aeromet is stronger than C158 or 9310. AFAIK it's only used in the LMT E-bolt. Bolt life is indefinite. S7 has been used by Sharps Rifle Co. They have had heat treat issues that led to broken bolts. Reportedly this steel has trouble in extremely low temperatures. Sorry I was half asleep and had my screaming daughter ... Ok and I am noob to this and looking for everyone helps for the best possible information... The Article will be for AR15.com So any input would be greatly appreciated I'll ask again. Is english your first language? Most of your sentences are incomplete and/or grammatically incorrect. You should have someone proof your writing before you submit. I can do it if you want. |
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I'll ask again. Is english your first language? Most of your sentences are incomplete and/or grammatically incorrect. You should have someone proof your writing before you submit. I can do it if you want. Quoted:
Quoted:
Quoted:
Is English your first language? You left out Aeromet and S7 for bolt materials. Aeromet is stronger than C158 or 9310. AFAIK it's only used in the LMT E-bolt. Bolt life is indefinite. S7 has been used by Sharps Rifle Co. They have had heat treat issues that led to broken bolts. Reportedly this steel has trouble in extremely low temperatures. Sorry I was half asleep and had my screaming daughter ... Ok and I am noob to this and looking for everyone helps for the best possible information... The Article will be for AR15.com So any input would be greatly appreciated I'll ask again. Is english your first language? Most of your sentences are incomplete and/or grammatically incorrect. You should have someone proof your writing before you submit. I can do it if you want. Yes English is my first language .. |
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Quoted: Tool Steel Extractor- Do they make a lower quality ones ??? Is the Tool Steel an upgrade or just necessary??? Sorry I am looking for more information about the extractor, so any input would be greatly appreciated.. Lot's of places say Tool Steel, but they don't specify the type of Tool Steel. Bryan from AIM is pretty helpful, so you might try asking him about the extractors they use and how they compare with other extractors. |
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Lot's of places say Tool Steel, but they don't specify the type of Tool Steel. Bryan from AIM is pretty helpful, so you might try asking him about the extractors they use and how they compare with other extractors. Quoted:
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Tool Steel Extractor- Do they make a lower quality ones ??? Is the Tool Steel an upgrade or just necessary??? Sorry I am looking for more information about the extractor, so any input would be greatly appreciated.. Lot's of places say Tool Steel, but they don't specify the type of Tool Steel. Bryan from AIM is pretty helpful, so you might try asking him about the extractors they use and how they compare with other extractors. Thanks I will have to check him out later and see if he can help out.. |
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•HPT Bolt (High Pressure Tested/ Proof) •MPI Bolt (Magnetic Particle Inspected) •Shot Peened Bolt •Chrome Lined Carrier •Chrome Lined Gas Key •Gas Key Hardened to USGI Specifications •Grade 8 Hardened Fasteners •Key Staked Per Mil-Spec •Tool Steel Extractor •Black Extractor Insert •Mil-Spec Crane O-Ring That's a good list. |
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Quoted: There are MIM extractors and gas keys and also ones machined from bar. Some advertise the MIM parts as "hardened to milspec" but some consider them to be less desirable. The MIM parts can be identified by the sprue or parting line. |
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I believe some are cast as well. Quoted:
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There are MIM extractors and gas keys and also ones machined from bar. Some advertise the MIM parts as "hardened to milspec" but some consider them to be less desirable. The MIM parts can be identified by the sprue or parting line. Right now I have a couple companies help me out with more and better information about the bcg and their experiences.. Oh what companies should make the list as far when buying a bcg?? |
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Quoted:
•HPT Bolt (High Pressure Tested/ Proof) •MPI Bolt (Magnetic Particle Inspected) •Shot Peened Bolt •Chrome Lined Carrier •Chrome Lined Gas Key •Gas Key Hardened to USGI Specifications •Grade 8 Hardened Fasteners ASTM A574 fasteners •Key Staked Per Mil-Spec •Tool Steel Extractor •Black Extractor Insert •Mil-Spec Crane O-Ring |
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•HPT Bolt (High Pressure Tested/ Proof) •MPI Bolt (Magnetic Particle Inspected) •Shot Peened Bolt •Chrome Lined Carrier •Chrome Lined Gas Key •Gas Key Hardened to USGI Specifications •Grade 8 Hardened Fasteners ASTM A574 fasteners •Key Staked Per Mil-Spec •Tool Steel Extractor •Black Extractor Insert •Mil-Spec Crane O-Ring Some people want to know what the difference is. Here http://store.curiousinventor.com/guides/screws/grades |
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