Quote:
Originally Posted by Tegboarder
Back to the .223/5.56 - The lower receiver is stamped with all the manufacturing information to include what the barrel that particular lower came out of the factory mounted to. If it's stamped .223 then it was made to only fire the .223 Remington and firing the hotter burning 5.56 will damage it. If it's stamped 5.56 it will fire both since it's made to handle that hotter burn.
Rambling complete.
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The reason you don't want to fire 5.56 in a 223 is the chamber pressure in the barrel, not because the lower.
This is from DPMS -
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PMS makes either a 5.56 or a .223 chamber.
To verify your chamber, look to the underside of the barrel, forward of the gas block for the barrel stamp. The stamp will indicate your chamber and twist rate. If your barrel is stamped .223, only American made, factory produced .223 ammo should be used.
DPMS does not warranty the use of 5.56 in our .223 chambers.
Because the .223 has a shorter throat to it's chamber than the 5.56, using the higher pressure 5.56 ammo will erode the throat leading to accuracy issues and possible malfunctions over time. The 5.56 chamber with it's longer throat is designed for the higher pressure rounds and will handle the lower pressure .223 without issue.
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