Arms Unlimited has a small number of European specification carbines available for purchase.
https://armsunlimited.com/colt-carbine-223-semi-auto-rifle-european-model/
This model is unique in that it has a serial numbered lower receiver, upper receiver and (I believe) bolt carrier group. It is actually .223 because the customer country can’t own 5.56mm. Comes with 1x 10-round magazine.
The Colt AR-15 Resource 
The 223Rem markings is due to the CIP regulations in force in Europe.
CIP does not recognize 5.56 but only 223Rem for civilian market. That’s why those Colt are marked 223Rem despite being chambered in 5.56.
I usually ream chambers to 5.56 specifications but get those proofed as 223Rem here in Belgium. As the CIP values for 223Rem are considered as “minimal chamber dimensions”, a 5.56NATO chamber is OK.
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The specifications on the sellers website state that they are supposed to actually be .223, which isn’t common among U.S. market products.
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Having gauged dozens of those Colt, I can affirm that those are 5.56 chambered.
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Nice find, for a collector. Otherwise, I’d prefer the 5.56 NATO chamber. The AU price is good.
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These will be grabbed up by collectors for sure.
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