AR Sponsor
Posted: 7/30/2013 10:56:31 AM EDT
|
Hi guys,
Is the bolt BCM completely non-magnetic or a part only? |
| MPI is worthless unless the part in question has been High Pressure (HP) tested. All BCM bolts are HP tested then magnetic particle inspected. As well as Colt and the other quality maker's who manufacture to the mil-spec. Alot of cheaper companies will MPI which is worthless unless you do the HP test first. |
|
Quoted:
MPI is worthless unless the part in question has been High Pressure (HP) tested. All BCM bolts are HP tested then magnetic particle inspected. As well as Colt and the other quality maker's who manufacture to the mil-spec. Alot of cheaper companies will MPI which is worthless unless you do the HP test first. The base material could still be defective whether it was HPT or not. MPI is simply a form of non-destructive inspection. You don't have to push a part to its limit in order for MPI to be effective. |
|
Quoted: The base material could still be defective whether it was HPT or not. MPI is simply a form of non-destructive inspection. You don't have to push a part to its limit in order for MPI to be effective. Quoted: Quoted: MPI is worthless unless the part in question has been High Pressure (HP) tested. All BCM bolts are HP tested then magnetic particle inspected. As well as Colt and the other quality maker's who manufacture to the mil-spec. Alot of cheaper companies will MPI which is worthless unless you do the HP test first. The base material could still be defective whether it was HPT or not. MPI is simply a form of non-destructive inspection. You don't have to push a part to its limit in order for MPI to be effective. |
|
Guys take it easy, English is not his first language. that said, HPT is NOT used by many "Tier 1" above and beyond milspec co. (KAC for example) as it is an antiquated form of testing which reduces bolt life. As long as the item is coming from a known quality in-house source (such as KAC) it is very unnecessary. If not sure of mfg. it does help to insure quality control is present. BCM is known quality, so buy assured it is good to go, HPT or not (although Im pretty sure they HPT all bolts anyways.) If I know my car is made by a quality mfg, why would I run it for 1000 mi. without oil just to "prove" my engine is good? I equate the same to HPT testing from KNOWN quality sources. YMMV. And OP, yes every BCM bolt is MPI tested. Its good kit, buy with confidence. |
|
OP's question is why his BCM bolt is slightly magnetic as compared to others he has. My guess it that it is residual magnetism from MPI. I checked a couple BCM bolts last night and sure enough the back side of each was slightly magnetic but the bolt face was not.
|
|
Quoted:
MPI is worthless unless the part in question has been High Pressure (HP) tested. All BCM bolts are HP tested then magnetic particle inspected. As well as Colt and the other quality maker's who manufacture to the mil-spec. Alot of cheaper companies will MPI which is worthless unless you do the HP test first. Noveske and Centurion both use bolts that are not HPT, wouldn't say either are worthless. |
|
Quoted: Guys take it easy, English is not his first language. that said, HPT is NOT used by many "Tier 1" above and beyond milspec co. (KAC for example) as it is an antiquated form of testing which reduces bolt life. As long as the item is coming from a known quality in-house source (such as KAC) it is very unnecessary. If not sure of mfg. it does help to insure quality control is present. BCM is known quality, so buy assured it is good to go, HPT or not (although Im pretty sure they HPT all bolts anyways.) If I know my car is made by a quality mfg, why would I run it for 1000 mi. without oil just to "prove" my engine is good? I equate the same to HPT testing from KNOWN quality sources. YMMV. And OP, yes every BCM bolt is MPI tested. Its good kit, buy with confidence. And in my opinion the running your car analogy is way off base. Apples to door knobs analogy. But that is just my opinion on the facts.
|
|
Quoted:
Noveske and Centurion both use bolts that are not HPT, wouldn't say either are worthless. Quoted:
Quoted:
MPI is worthless unless the part in question has been High Pressure (HP) tested. All BCM bolts are HP tested then magnetic particle inspected. As well as Colt and the other quality maker's who manufacture to the mil-spec. Alot of cheaper companies will MPI which is worthless unless you do the HP test first. Noveske and Centurion both use bolts that are not HPT, wouldn't say either are worthless. He didn't state that the bolts were worthless, he said MPI was worthless without first performing HPT. |
|
Quoted:
that said, HPT is NOT used by many "Tier 1" above and beyond milspec co. (KAC for example) as it is an antiquated form of testing which reduces bolt life. As long as the item is coming from a known quality in-house source (such as KAC) it is very unnecessary. If not sure of mfg. it does help to insure quality control is present. BCM is known quality, so buy assured it is good to go, HPT or not (although Im pretty sure they HPT all bolts anyways.) If I know my car is made by a quality mfg, why would I run it for 1000 mi. without oil just to "prove" my engine is good? I equate the same to HPT testing from KNOWN quality sources. YMMV. And OP, yes every BCM bolt is MPI tested. Its good kit, buy with confidence. He is from OH what exactly is his first language???? We were addressing a subsequent post which you seem to be replying to. With the exception you got your post's locations wrong. And in my opinion the running your car analogy is way off base. Apples to door knobs analogy. But that is just my opinion on the facts. Quoted:
Quoted:
Guys take it easy, English is not his first language. If I know my car is made by a quality mfg, why would I run it for 1000 mi. without oil just to "prove" my engine is good? I equate the same to HPT testing from KNOWN quality sources. YMMV. And OP, yes every BCM bolt is MPI tested. Its good kit, buy with confidence. He is from OH what exactly is his first language???? We were addressing a subsequent post which you seem to be replying to. With the exception you got your post's locations wrong. And in my opinion the running your car analogy is way off base. Apples to door knobs analogy. But that is just my opinion on the facts. The guy was talking about the OP, who lists his location as FRA and obviously writes in broken English. Besides which, he is correct. The only reason to use HPT followed by MPI is during R&D or Testing & Evaluation. With today's process controls, starting off with a known good metal, and established manufacturing processes, the only thing you are doing to a bolt with HPT is reducing its life by that one over-pressured round. |
|
Quoted:
He didn't state that the bolts were worthless, he said MPI was worthless without first performing HPT. Quoted:
Quoted:
Quoted:
MPI is worthless unless the part in question has been High Pressure (HP) tested. All BCM bolts are HP tested then magnetic particle inspected. As well as Colt and the other quality maker's who manufacture to the mil-spec. Alot of cheaper companies will MPI which is worthless unless you do the HP test first. Noveske and Centurion both use bolts that are not HPT, wouldn't say either are worthless. He didn't state that the bolts were worthless, he said MPI was worthless without first performing HPT. Indded, you are correct Sir. My statement is correct as well. The TDP calls for the bolt to be HP tested with the M197 HP round and then the bolt is MP inspected. Alot of lower quality companies skip the HP test and MPI the bolt which is worthless. To the folks who responded negatively to my post above reading comprehension is your friend. Read before you jump to attack my statement. |
|
Quoted:
Indded, you are correct Sir. My statement is correct as well. The TDP calls for the bolt to be HP tested with the M197 HP round and then the bolt is MP inspected. Alot of lower quality companies skip the HP test and MPI the bolt which is worthless. To the folks who responded negatively to my post above reading comprehension is your friend. Read before you jump to attack my statement. Quoted:
Quoted:
Quoted:
Quoted:
MPI is worthless unless the part in question has been High Pressure (HP) tested. All BCM bolts are HP tested then magnetic particle inspected. As well as Colt and the other quality maker's who manufacture to the mil-spec. Alot of cheaper companies will MPI which is worthless unless you do the HP test first. Noveske and Centurion both use bolts that are not HPT, wouldn't say either are worthless. He didn't state that the bolts were worthless, he said MPI was worthless without first performing HPT. Indded, you are correct Sir. My statement is correct as well. The TDP calls for the bolt to be HP tested with the M197 HP round and then the bolt is MP inspected. Alot of lower quality companies skip the HP test and MPI the bolt which is worthless. To the folks who responded negatively to my post above reading comprehension is your friend. Read before you jump to attack my statement. Just because that is what the TDP requires, does not mean MPI is worthless. Is it worthless when it comes to following the TDP? Certainly. But MPI in itself is not worthless if you simply want to ensure the metal you used does not have flaws. It would especially make sense if the metal being used is not exactly the metal that is called out for in the TDP, as in, some other "inferior" metal. Many companies make ARs without following the TDP to the letter, and their ARs are not breaking left and right. There are shit companies out there, but the majority make ARs that work for 98% of the AR shooting community. |
|
Quoted: The guy was talking about the OP, who lists his location as FRA and obviously writes in broken English. Besides which, he is correct. The only reason to use HPT followed by MPI is during R&D or Testing & Evaluation. With today's process controls, starting off with a known good metal, and established manufacturing processes, the only thing you are doing to a bolt with HPT is reducing its life by that one over-pressured round. Quoted: Quoted: Quoted: Guys take it easy, English is not his first language. If I know my car is made by a quality mfg, why would I run it for 1000 mi. without oil just to "prove" my engine is good? I equate the same to HPT testing from KNOWN quality sources. YMMV. And OP, yes every BCM bolt is MPI tested. Its good kit, buy with confidence. He is from OH what exactly is his first language???? We were addressing a subsequent post which you seem to be replying to. With the exception you got your post's locations wrong. And in my opinion the running your car analogy is way off base. Apples to door knobs analogy. But that is just my opinion on the facts. The guy was talking about the OP, who lists his location as FRA and obviously writes in broken English. Besides which, he is correct. The only reason to use HPT followed by MPI is during R&D or Testing & Evaluation. With today's process controls, starting off with a known good metal, and established manufacturing processes, the only thing you are doing to a bolt with HPT is reducing its life by that one over-pressured round. |
|
Quoted:
I know you are trying to help but read the context. He intermingled the two posts. H53 and I were responding to the MPI is worthless thread. Nobody jumped on anybody about anything yet he is saying give the guy a break he speaks broken English. The only contraversial replied were about MPI. Read the context. Quoted:
Quoted:
Quoted:
Quoted:
Guys take it easy, English is not his first language. If I know my car is made by a quality mfg, why would I run it for 1000 mi. without oil just to "prove" my engine is good? I equate the same to HPT testing from KNOWN quality sources. YMMV. And OP, yes every BCM bolt is MPI tested. Its good kit, buy with confidence. He is from OH what exactly is his first language???? We were addressing a subsequent post which you seem to be replying to. With the exception you got your post's locations wrong. And in my opinion the running your car analogy is way off base. Apples to door knobs analogy. But that is just my opinion on the facts. The guy was talking about the OP, who lists his location as FRA and obviously writes in broken English. Besides which, he is correct. The only reason to use HPT followed by MPI is during R&D or Testing & Evaluation. With today's process controls, starting off with a known good metal, and established manufacturing processes, the only thing you are doing to a bolt with HPT is reducing its life by that one over-pressured round. The context is the guy was referring to the OP, then went on to give his thoughts on the MPI issue. Practice what you preach. |
|
Stay calm my friends ! We are not here to bicker.
I contacted my friend who have the BCM magnetic bolt, and according him, he have an other one, who is non-magnetic, from the same maker same maker. He bought these bolts this year. And the question seem clear, no ? Is the bolt BCM completely non-magnetic or a part only? |
|
Quoted:
Stay calm my friends ! We are not here to bicker. I contacted my friend who have the BCM magnetic bolt, and according him, he have an other one, who is non-magnetic, from the same maker same maker. He bought these bolts this year. And the question seem clear, no ? Is the bolt BCM completely non-magnetic or a part only? I think you already have your answer. It is probably residual magnetism from the MPI process. They may also use some kind of magnet to move them from one place to another along the assembly line which imparts magnetism to the part. In either case, I doubt it is done purposely, and it doesn't matter at all. |
|
Quoted:
BTW, my friend use only cartridges brass, so, it's not a problem. If he used the metal cart, doubtless the problem would be different. Amen ! What problem? The magnetism is on the opposite side of where the case operates and it is barely strong enough to lift a cotter pin. What problem could possibly be caused by this? |
Ultra small metal particles and accumulation without cleaning completely. As, here : http://www.slip2000.com/blog/colt-with-15000-rounds/
|
|
Quoted: The context is the guy was referring to the OP, then went on to give his thoughts on the MPI issue. Practice what you preach. Quoted: Quoted: Quoted: Quoted: Quoted: Guys take it easy, English is not his first language. If I know my car is made by a quality mfg, why would I run it for 1000 mi. without oil just to "prove" my engine is good? I equate the same to HPT testing from KNOWN quality sources. YMMV. And OP, yes every BCM bolt is MPI tested. Its good kit, buy with confidence. He is from OH what exactly is his first language???? We were addressing a subsequent post which you seem to be replying to. With the exception you got your post's locations wrong. And in my opinion the running your car analogy is way off base. Apples to door knobs analogy. But that is just my opinion on the facts. The guy was talking about the OP, who lists his location as FRA and obviously writes in broken English. Besides which, he is correct. The only reason to use HPT followed by MPI is during R&D or Testing & Evaluation. With today's process controls, starting off with a known good metal, and established manufacturing processes, the only thing you are doing to a bolt with HPT is reducing its life by that one over-pressured round. The context is the guy was referring to the OP, then went on to give his thoughts on the MPI issue. Practice what you preach. Whatever dude.
|
AR Sponsor