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M4 Extractor Tension


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Has anyone noticed their extractor tension lightening up a small amount after you put some shells through the gun?  Like maybe the first 100-200 or so?  Perhaps its just breaking and the spring taking an initial set.

One of my bolt heads has noticeably less extractor tension than a new bolt head that I compared it to.  I don't think it's cause for alarm but I can notice a distinct difference.  I'm wondering if there is something else at play here besides break in.

Edited by Milspec
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