Newer 870?

RobOz

August 18, 2013 07:24

How are the extractors on newer 870"s manufactured?

Thanks,

RobOz

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  Hangfire

  August 19, 2013 05:17

  The extractors are MIM manufactured..
  
  http://en.wikipedia.org/wiki/Metal_injection_molding
  
  Brownells offers a machined steel replacement..
  
  http://www.brownells.com/shotgun-parts/extractor-parts/extractors/extractor-non-mim-prod10745.aspx
  
  Remingtons Law Enforcement/Police models come standard with machined extractors, as well as other upgraded parts and enhancements..
  
  http://www.educationalsurplus.com/sms/docviewer/aucdoc/Remington Shotguns-diff. between 870 model types.pdf?auc=556233&docid=3346963

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  RobOz

  August 19, 2013 10:40

  thanks. That MIM sounds like a nice way to say cast pot metal.

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  eastbank

  August 19, 2013 11:16

  not cast pot metal. according to garp.

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  tsr1965

  August 20, 2013 08:55

  MIM...Metal Injection Molding. All depends on the metal being molded and its properties, but the metal is injected into the mold under a lot higher pressure than your normal cast pot metal.
  
  The metal for gun-parts, is a high strength, low alloy ferrite bering metal.
  
  Best

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  beantownshootah

  August 21, 2013 06:37

  quote:Originally posted by RobOz
  thanks. That MIM sounds like a nice way to say cast pot metal.
  
  
  Its not at all.
  
  "Pot metal" refers to cheap zinc alloys that are easy to make but are soft and offer poor durability.
  
  "MIM" refers to a specialized process using super-fine steel particles mixed with a binder, injected into a mold, then fired at nearly the metal melting temperature to make the binder burn off and the particles fuse together. Its somewhat similar to the older "sintering" process, only more advanced, and far better.
  
  When done correctly, MIM parts are quite tough, nearly as strong as forged metal parts, though potentially less expensive to manufacture.
  
  Plenty of "name" gun companies (including Ruger, Smith and Wesson, etc) are building their gun FRAMES with MIM, not to mention a variety of other parts and these parts are plenty tough. Remington uses MIM on LOTS of its internal parts. . .I'd be shocked if the extractor was the ONLY MIM part on a new 870.
  
  I wouldn't argue that forged/machined steel parts aren't *potentially* better, but it depends on the exact application. For sights and triggerguards or such, that aren't subject to repeated stress, MIM probably *IS* better because its cheaper.
  
  For extractor. . .probably not quite as good, though still adequate.

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  charliemeyer007

  August 21, 2013 18:37

  I like all milled steel. They can keep their plastic injected molded guns. I wait for the day when they announce that the anti-oxidant got left out much like the plastic water line fittings fiasco.

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