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Posted: 12/28/2005 5:47:23 AM EDT
I have a A2 upper only marked with a keyhole, the barrel has no markings. How would I find out if it's 223 or 5.56mm?

Thanks
Link Posted: 12/28/2005 7:44:47 AM EDT
Key hole is for Cerro Forge, currently used by all the various manufacturer's. Where did you get the upper from?
Link Posted: 12/28/2005 1:54:15 PM EDT
contact whoever you bought it from
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