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Posted: 7/28/2006 5:46:07 PM EDT
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Who would you recomend for a bolt carrier assembly, so far my build is all bushmaster, should i stick with it or get something a little cheaper |
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Up to you... I belive these are DPMS for $95 www.ar15web.com/products.php?cat=19 There are a host of great bcg's out there for $110 or so... |
| Do yourself a favor and make sure you get one that is properly staked. LMT, Colt, are tops. Rock River had some for a great price also. It was a deal through the dealers. Check Teknic. I think it was like 109.00 or so complete. Hard to beat that if he still has them on sale. |
MP = Magnetic Particle Magnetic Particle Testing Magnetic Particle Testing (MPT) is an NDT technique that relies on local or complete magnetisation of the component or surface being interrogated. It can only be applied to Ferromagnetic parts. When a crack is present on the surface, then some magnetic flux will leak out from the sides of the crack (provided that the magnetic flow is in a suitable direction relative to the crack). Small magnetic particles, if they are allowed to flow over the magnetised surface, can be attracted to this flux leakage (just like iron filings are attracted to the flux leakage from the ends of a bar magnet). If these particles are suitably coloured, or the background is suitably coloured, this concentration of particles will enhance the image of any cracks. Frequently, the particles are suspended in a liquid medium to enhance fluidity (often a hydrocarbon), and in many cases, they are coloured to enhance contrast. For the most sensitive applications, Fluorescent coated particles are used, and inspection is carried out under an Ultra Violet light. This enhances the detection even more. The integrity of the inspection relies on the operator to induce an adequate magnetic flux in the surface being tested, the lighting conditions, contrast media and orientation of the defects relative to the induced flux. The operator must also inspect the surface to detect any defects. Defect detection depends upon the surface condition of the area being inspected, with defects smaller than three times the surface roughness being unlikely to be detected. Under optimal conditions, and with very good surfaces, detection of defects of about 0.5mm long can be achieved (depths from about 0.02mm). |
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