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1/25/2018 7:38:29 AM
Posted: 8/2/2002 1:21:12 PM EST
on most AR-15s & AR-15 clones the lower receiver is marked ".223 Rem.".......

looking at the barrel, if it has markings, they are stamped "5.56mm"

can any one offer an explanation to the contradiction ??

is this why so many people ask about the .223 Rem. & 5.56mm being different but the same ?????

Link Posted: 8/2/2002 1:55:01 PM EST
Some early receivers are marked .223 because they were made before the 5.56mm became standard. Colt marks their 'civilian' lowers 'Cal. 223' for the same reason they keep screwing around with pin diameters and sear blocks. It's part of their Kow-Tow to the folks who think the great unwashed shouldn't have scary black rifles.

If the barrel is marked 5.56mm then the chamber is cut to the 5.56mm NATO standard. A .223 chamber is tighter in certain dimensions than a 5.56 chamber. That gives the .223 greater potential for accuracy but less tolerance for variations found in mass produced (military) ammo.
Link Posted: 8/2/2002 2:48:34 PM EST

Originally Posted By CantHitShit:
Some early receivers are marked .223 because they were made before the 5.56mm became standard. Colt marks their 'civilian' lowers 'Cal. 223' for the same reason they keep screwing around with pin diameters and sear blocks. It's part of their Kow-Tow to the folks who think the great unwashed shouldn't have scary black rifles.

If the barrel is marked 5.56mm then the chamber is cut to the 5.56mm NATO standard. A .223 chamber is tighter in certain dimensions than a 5.56 chamber. That gives the .223 greater potential for accuracy but less tolerance for variations found in mass produced (military) ammo.



See also: Q. What is the difference between 5.56×45mm and .223 Remington ammo?
Link Posted: 8/4/2002 4:41:27 PM EST
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