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AR15 gas systems and parts question

Discussion in 'Rifle Country' started by Alex45ACP, Apr 7, 2010.

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  1. Alex45ACP

    Alex45ACP Member

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    Other than the barrel, gas tube, and handguards, is there any difference in parts between an AR15 with a 16" barrel and midlength gas system, and an AR15 with a 16" barrel and carbine length gas system?

    Could you switch a 16" barrel midlength gas system upper to a 16" or 14.5" barrel carbine gas system upper simply by changing those parts?
     
  2. Bartholomew Roberts

    Bartholomew Roberts Moderator Emeritus

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    No, no difference and yes, they can be changed
     
  3. benEzra

    benEzra Moderator Emeritus

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    The only difference I see other than the barrel, gas tube, and handguards is that the extractor spring and insert *may* be different, depending on the rifles in question. The consensus over on M4carbine.net seems to be that the heavy-duty extractor spring and black insert are required for reliable operation of a carbine-length gas system, but aren't necessary on a midlength because extraction is less violent. As a result, you might see different springs/inserts on a top-tier carbine extractor vs. a new-in-the-box midlength extractor.

    I doubt it would be a problem to run the stiffer carbine-style spring and insert on a middy, though, so you wouldn't necessarily have to change them.
     
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