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Posted: 4/19/2009 11:50:52 AM EDT
| After a few hundred rounds a few weeks back, I went to put the .223 bolt back in and I can't remove my CMMG conversion unit from the upper. Anyone else seen this issue? |
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I don't think I cleaned the chamber, at least not thoroughly, before I put in the conversion. I was at the range and had shot 90 .223 rounds and switched into the conversion unit. No lacquered ammo. After poking around on the web, sounds like either the crud in the chamber got hot and melded to the chamber adapter, or the adapter itself may have split and has expanded in the chamber - or a combination of both.
I've tapped and pried on it a good bit already and wanted other thoughts before I booger'd any of it up getting it out. |
| Man up - remove the upper from the lower, then grab the charging handle and retract it forcefully and repeatedly so that the bolt hits the back of the device. The pounding will eventually pop the whole unit out of the upper. Next time, clean and lightly lube the chamber. |
| Take the upper off of the lower. Spray some WD 40 or some other kind of penetrating oil into the chamber area and down the barrel. Hopefully, it will soak into the chamber area and around the coversion unit. Then, put a cleaning rod down the barrel and use that to push the conversion kit out. Smack the cleaning rod with shoe or a wooden block. Something will a little ass to it .... but nothing solid like a metal hammer. A rubber mallet would work. Treat it like a stuck case. It should come out. Then clean them both ..... and get that WD 40 out of there. |
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Quoted:
After a few hundred rounds a few weeks back, I went to put the .223 bolt back in and I can't remove my CMMG conversion unit from the upper. Anyone else seen this issue? I have seen it on a few uppers over the last few years where the chamber adapter had actually began to rust and got stuck in the chamber (one of them was mine - stupid me left the kit in the gun for a few days after using it, so it wasn't stuck that bad). I would personally recommend not leaving any parkd/blued conversion kits in the chamber any longer than necessary while shooting - remove them immediately when done, oil them, and put them away. I'd try the penetrating oil over repeated brute force attacks myself - hopefully you will be able to get your kit out without damaging the chamber adapter or busting the backplate off the unit. |
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After soaking for an hour with WD-40 and a few seconds with Rust Away, I was able to tap directly against the backplate and the unit finally broke free. The weld seam of the chamber adapter looks intact, so it was likely the grime and fouling in the chamber. Everything appears to be salvaged minus a few minor scars on the underside the upper where I tried to tap with leverage. Appreciate the help.
Lesson learned - clean before and after shooting the conversion unit! |
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