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The barrel is dimpled for the gas block set screws and is lined up and test fired from the factory.
The Luth-AR .223 Bull Rifle Kit is chambered in .223, and would not be able to fire 5.56 safely. With a 5.56 stamped barrel, you can fire both 5.56 and .223 safely. A barrel chambered/stamped in .223, can only use .223.
This Luth-AR .223 Bull Rifle Kit should not be used with 5.56. A barrel chambered in 5.56 can safely use both .223 and 5.56. The same applies for barrels in .223 Wylde. You can find out more from this how-to guide that explains the differences between 5.56 and .223:
https://www.opticsplanet.com/howto/223-remington-vs-5-56mm-nato-ammo.html