I recently purchased an AR chambered in 223/556. Does it matter what caliber I use to break the gun in?

Question

I recently purchased an AR chambered in 223/556.  Does it matter what caliber I use to break the gun in?

Randy I. · Answer

you can use either as you gun is chambered 223/556

James G. · Answer

No, it does not.  You can use either Jeremy.  The actual "projectiles or bullets" are identical in both 5.56 or .223.

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