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M4 Ejection Issue..Maybe?


Nitro

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Has anyone with an M4 ever experienced any failures to eject a spent shell when using Hornady Critical Defense rounds?  My M4 has only got about 150 rounds through it, but has yet to have a problem with absolutely anything else I've tried to feed it. Various brands, 00 , #4 buck or slugs, low recoil and magnum rounds all function perfectly.  The first shell would feed fine, fire, then fail to eject which caused a jam (obviously).  The bolt would cycle completely, but leave the spent shell in the chamber.  This would happen every other round or so.  Went through 20 rounds from a few different boxes/lots, same result.  I finally gave up on the Critical Defense and started using Winchester Ranger Magnum 00 Buck and 50 of them cycled perfectly.  Very odd, considering my experience with Hornady ammo in various calibers has always been positive.

 

Any thoughts?

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Obviously your gun doesn't like that particular ammo but works fine with everything else so a non issue IMO. Just for fun, I would closely examine/compare the rims of the Hornady ammo with the rims on the other brands.

For some reason it seems like your extractor slips off of the shell rim instead of grippping and pulling it out of the chamber.

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On 12/19/2019 at 1:22 AM, Evolution said:

For some reason it seems like your extractor slips off of the shell rim instead of grippping and pulling it out of the chamber.

Yea, that's exactly what it seems to be doing.  I tested some more Critical Defense this weekend after a complete takedown and cleaning, with the same results.  That said, I'm not to concerned.  I'm more than happy to stick with the Win Ranger or military grade buck since it performs well, functions flawlessly, and i already have a ton of both.   TBH, I was just curious to see if this was a known issue with this particular ammo or if it was just me and my M4.

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