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Old March 20th, 2019, 09:51 AM #11
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Time to get a PCC that works, such as an MPX/MP5 or upgrade to the guard rotating bolt system. Also those aluminum cases arent recommended for blowback guns.
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Old March 20th, 2019, 10:10 AM #12
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I did not notice the "aluminum" part earlier but I have indeed had a lot of problems with alum cased 9mm. Not just in my PCC, but all my 9mm. Brass works fine in all. Alum 9mm tends to jam all my guns and fails to eject, more so when dirty. I suspect that the case is soft and expands too much. On one gun RSO and I had to hammer the action open to eject the spent cartridge. Never a single problem with brass or steel no matter how dirty. Some (not all) of the problems could be due to alum cased 9mm. I would stop using it personally and diagnose one problem at a time.
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Old March 20th, 2019, 10:32 AM #13
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The CMMG carbine worked fine until around the 2500th round. No idea how many rounds before I bought it (used). The "Spike's" was fine until the key broke. Both ran brass, steel, and aluminum case just fine. I'm wondering if the extractors need replacement after however many rounds.
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Old March 20th, 2019, 11:22 AM #14
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But youve had problems with 4 different BCGs as I read your OP. Maybe the first one needed the extractor replaced due to wear, I'd buy that, but all of them? Bending the ejector worked on one, so maybe its a design flaw. But again, on all of them? If this was a typical quality control issue or design flaw, CMMG you would think would have improved the design ("Gen 2" lol) or had a recall or something.

Or maybe you are just unlucky and had 4 different problems. In which case, you got it working, you will never figure out what was wrong with the others. Like I said though, i have had a lot of problems with aluminum case.
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Old March 20th, 2019, 12:15 PM #15
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Quote:
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The CMMG 9mm now has a 3rd BCG and it's still not running right for stuff it used to work with. One interesting development, I fired three different loads out of it, but instead of using the optic, I used the attached laser to aim so I could watch what was going on. With 115gr Federal aluminum case, the rounds were dribbling out of the gun and brass was caught in the ejection port. I had a neat pile of brass on the table right next to the rifle With 124gr Sig brass cased, ejection was brisk and it worked fine. With Sig 147gr, the brass was once again dribbling out of the port and I was getting brass stuck in the port. This on top of the gas key in my Spike's (which was working fine until this week) snapped off. Spike's only uses one screw to hold the gas key on. I will call them up on Monday to see if I can get a replacement under warranty or not. So I was forced to shoot Steel Challenge with a pistol today.
Had the same problem. Tried EVERYTHING and spent hundreds throughout a year. Finally got CMMG to put me on the line with their R&D devision and they immediately had an answer for a common issue. Your ejector needs to be bent inward about 6 using a deadblow hammer.
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Old March 20th, 2019, 12:17 PM #16
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And NEVER use aluminum case
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Old March 20th, 2019, 12:43 PM #17
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Your ejector needs to be bent inward about 6 using a deadblow hammer.
I used pliers.
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Old March 23rd, 2019, 06:21 AM #18
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Aluminum case ammo will generally not work properly in a carbine. Avoid it.
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Old March 24th, 2019, 06:29 PM #19
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I’ve been using Auminum exclusively in my AR9. Put 500 through it Friday without a problem. CMMG BCG, FTM buffer system, and ballistic advantage barrel.
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