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Posted: 10/5/2003 4:30:30 PM EDT
I just bought a Colt ar-15 that says "Match Target" and "Lightweight" on the lower.

The upper reads: C MP 5.56 NATO 1/7

What does the "C MP" mean??

Thank you guys in advance.
Link Posted: 10/5/2003 4:48:36 PM EDT
[Last Edit: 10/5/2003 4:49:56 PM EDT by bigbore]
Link Posted: 10/5/2003 5:05:20 PM EDT
If I'm not mistaken, it's Colt magnetic particle tested. the B MP on the Bushmasters is Bushmaster magnetic particle. Exactly what this process is, I don't know. But it's a method for checking the barrels integrity. Mark
Link Posted: 10/5/2003 5:09:29 PM EDT
Go to this link and you will find everything you need to know about AR15 barrel and bolt markings. http://www.biggerhammer.net/ar15/barrelsbolts/
Link Posted: 10/5/2003 7:08:26 PM EDT
Megnetice partical test is when they take and magnatised the barral and sprinkle iron shavings on it to see if there are any micro cracks in the barral. i am a AMT student at NMU we have equipment for "non destructive testing" which uses Partical testing and a type of testing that uses black light to find cracks, but thats what the point of this test is, is to find any defects to the object thats being tested without destorying it
Link Posted: 10/5/2003 7:21:25 PM EDT
You guys are extremely smart and helpful, THANK YOU!!!!!
Link Posted: 10/5/2003 8:54:56 PM EDT
For any gear heads out there, MP is the same process used to check your engine block for cracks.
Link Posted: 10/6/2003 8:34:19 AM EDT
Match Target is a young rifle that has not molted into an AR15. It will take roughly 324 days 12 hours and 30 minutes for the metamorphosis process to be complete. After this time period, your Match Target will sprout a flash suppressor and a bayonet lug. If you treat it well and feed it a good diet of premium ammunition, it will have a long productive life. When it gets old and cranky, send it to me, I will put it out to pasture.
Link Posted: 10/6/2003 10:30:35 AM EDT
Originally Posted By Hoplophile: For any gear heads out there, MP is the same process used to check your engine block for cracks.
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I was about to ask what the difference was between "Magentic Particle" and "MagnaFlux." Nothing, I guess. [:D]
Link Posted: 10/6/2003 5:15:06 PM EDT
Originally Posted By Fruit_of_the_Looms: I was about to ask what the difference was between "Magentic Particle" and "MagnaFlux."
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Same as the difference between "facial tissue" and "Kleenex"
Link Posted: 10/6/2003 8:46:57 PM EDT
Originally Posted By bigbore: AFAIK, "Match Target" replaced the Evil text that once read AR15...
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No. AR15 was replaced by "Sporter" circa 1989. Sporter replaced by "Match Target" fall 1994.
Link Posted: 10/7/2003 12:08:17 AM EDT
Link Posted: 10/7/2003 1:42:52 AM EDT
[Last Edit: 10/7/2003 2:57:20 AM EDT by AK_Mike]
Sometimes I think Match and Match Target means they get to raise the price...[;D]
Link Posted: 10/7/2003 2:27:21 AM EDT
I think politically correct was already taken.
Link Posted: 10/7/2003 3:27:13 AM EDT
In the case of military markings, and this is per the military prints for the barrel and bolts, the [b]M[/b] is for Magnetic particle testing and the [b]P[/b] is for Proof load testing.
Link Posted: 10/7/2003 9:48:26 AM EDT
The difference? MagnaFlux is the name of a company that produces chemicals used in the Magnetic Particle Process of Non-Destructive Inspection (NDI). [url]http://www.magnaflux.com/index.htm[/url] Magnetic Particle is the name of a specific type of Non-Destructive method of Inspection for ferris metals. US Navy Technical Manual Aviation Structural Mechanic Magnetic Particle Inspection Magnetic particle inspection is a rapid, non- destructive means of detecting discontinuities in parts made of magnetic materials. If the part is made from an alloy that contains a high percentage of iron and can be magnetized, it is in a class of metals called “ferro- magnetic,” and it can be inspected by this method. If the part is made of material that is nonmagnetic, it cannot be inspected by this method. The magnetic particle inspection method will detect surface discontinuities, including those that are too fine to be seen with the naked eye, those that lie slightly below the surface, and, when special equipment is used, the more deeply seated discontinuities. CIRCULAR MAGNETIZATION. Circular magnetization is used for the detection of radial discontinuities around edges of holes or openings in parts. It is also used for the detection of longitudinal discontinuities, which lie in the same direction as the current flow either in a part or in a part that a central conductor passes through. LONGITUDINAL MAGNETIZATION. Longitudinal magnetization is used for the detection of circumferential discontinuities, which lie in a direction transverse to or at approximately right angles to a parts axis. Electric current is used to create a longitudinal magnetic field in a piece of magnetic material. When a part of magnetic material is placed inside a coil the magnetic lines of force created by the magnetizing current concentrate themselves in the part and induce a longitudinal magnetic field. Magnetic particles may be applied as a dry powder, or wet, by using either water or a high flash point petroleum distillate as a liquid vehicle carrier. Dry powder is available in various colors, so the user can select the color that contrasts best with the color of the surface upon which it is used. Colors for use with ordinary visible light are red, grey, black, or yellow. Red- and black-colored particles are available for use in wet baths with ordinary light, and yellow-green fluorescent particles for use with a black light. Fluorescent particles are widely used in wet baths, since the bright fluorescent indications produced at discontinuities are readily seen against the dark backgrounds that exist in black light inspection areas.
Originally Posted By Hoplophile:
Originally Posted By Fruit_of_the_Looms: I was about to ask what the difference was between "Magentic Particle" and "MagnaFlux."
View Quote
Same as the difference between "facial tissue" and "Kleenex"
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