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I've heard this rumor about the M4 and M16: If you place the bolt carrier group bolt-down on a table and the weight of bolt carrier group is able to push the bolt into the locked position, the extractor spring needs to be replaced.

True or not?
 

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Fact or fiction

The extractor spring has nothing to do with it. The gas rings are the only hang up. They rarely wear out.
 
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