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Posted: 9/19/2012 6:37:15 PM EDT
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A friend recently acquired an older Ciener Atchisson conversion kit. It slid in smoothly up to the last 1/16" of an inch and then pushed in with a little effort. Seemed to shoot well but now will not extract from the upper. I currently do not have a vise block(on order) but have tapped with a brass punch to no avail.
Any suggestions ? Thanks |
Take the upper off the lower, flip it over, and use a screwdriver to pry against the chamber adapter and front receiver lug. Prying on any other part of the conversion is liable to ruin it. I'll post a pic when I get home.
Put a spacer behind the receiver lug so you're prying against that and not the actual receiver, if you don't want to damage the anodizing. |
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chibajoe
U da man ! Thank you! I folded a business card several times to take up the space and protect the lower, I still had to get a mugambo screwdriver but it popped free. Without damage! Of course I had to try and drop it into a different upper... Same story, stopped about .1 short of seating all the way, this time I did not push it 
I own another conversion kit, I will check the diameters up and down and see where the problem is. Thanks again. duckmanmark |
I had the exact same thing happen, except I pried at the "not here" part and the whole back plate of the conversion snapped off. 
CMMG were champs about it, though, and replaced the unit for me anyway. If you're feeling brave, take some fine sandpaper (like 400 grit) and lightly sand down the outside of front of the chamber adapter. I guess the old ones were cut for 5.56 chambers and can be a little tight in .223 or Wylde chambers. The metal on my replacement conversion is noticeably thinner at the very front. ETA: One thing I've noticed is that the old conversion was more accurate than the replacement, so maybe it being stuck in there wasn't necessarily a bad thing, so long as you have a way of getting it out. |
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