You can take a cast of the chamber and measure it, or if you want a 5.56 chamber, just use Ned Christiansen's 5.56 reamer. If you get metal out, it weren't 5.56.
MBR
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You can take a cast of the chamber and measure it, or if you want a 5.56 chamber, just use Ned Christiansen's 5.56 reamer. If you get metal out, it weren't 5.56.
MBR
The reamers are made on the larger end of the spectrum for 5.56mm NATO. So on many barrels Neds reamer will remove some metal from some chambers including Colt and LMT.
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I was aware of the chamber cast, but I'm still wondering how close you can measure leade dimensions. I guess you can get pretty close, and for certain you can measure throat diameter accurately. so that would be a good indicator.
Ned's chamber reamer is a tad bigger than 5.56 IIRC. I believe he's posted that, either here or on his website. Just because you get some metal removal, I don't think it's accurate to automatically infer that the chamber just reamed was a SAAMI chamber.
Maybe Ned can chime in here and provide a clarification.
If you reamed the chamber, wouldn't you remove the chrome lining? Although that's probably a secondary concern if you're trying to size it. I put a MI 2 piece forearm on my RRA. I had such trouble getting the lower 1/2 on, I needed extra hands. I can't get it off by myself, but Gotm4, I'm further confused by your list of codes for ".223" barrels. I thought we were talking 5.56 chambers. My barrel is chrome lined 10.5". There's only one code listed for that so I expect that's what I'll find when I get the handgaurd off.
RRA 5.56 chambers trend toward the small end (at best), and the problems/indications of tight(er) chambers have been observed in several.
I've reamed chambers with Ned's reamer, including chrome lined. No problems. As on his website, it removes chrome that will erode anyway.
I've reamed Colts, too, but removed only a tiny bit of material.
Ned's reamer is must have for maintainers, especially those infected by "good-as."
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