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1/25/2018 7:38:29 AM
Posted: 7/22/2003 6:15:39 AM EST
Hi everyone, y'all have been loads of help for newbies like me. I've been reading the forums, TM's and studying pictures for weeks and finally started getting parts for my first build. I thought I had things squared away so far but suddenly got confused with the whole .223 vs 5.56 issue. I have so far a Colt surplus barrel ass'y (NOS, 20", thin, triangle guards), an A1 upper receiver (no internals yet), and ordered the RRA U.S. marked lower from LT.
My question is this; I don't see any markings on the barrel or upper as to their caliber - what can I check/measure to verify what it is? Also, what do I need to keep in mind for my build if I want to gear it toward the 5.56? and do i really need to concern myself with the .223/5.56 difference for just a shadetree shooter?
I will have to install the barrel onto the receiver and plan on getting a new bolt/carrier assembly so what are the chances of the headspace being wrong? and does that relate to the .223/5.56 issue at all?

Thanks a bunch for any thoughts and suggestions!
Link Posted: 7/22/2003 8:50:41 AM EST
[url]www.ammo-oracle.com[/url] The Ammo Oracle has the answer! The short version is no, it shouldn't matter to you. 5.56 chambers are a little looser than .223 chambers, but as a practical matter it's almost the same thing. Either way, it's not a headspace issue.
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