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5.56x45 Ammo (AR-15)

5.56x45 Ammo (AR-15)

5.56 ammo is extremely popular among American AR-15 shooters. If your rifle is stamped with "5.56" or "5.56x45" you've got the right caliber. However, if you have a rifle with "223" or "223 Rem" on it, you'll want to browse our slightly lower pressure 223 ammo line-up to avoid potential problems.

If you have a 1:8 or 1:9 twist rate barrel, you should have good results with any bullet weight from about 45 grain to 77 grain, including the popular mil-spec M193 and M855 loads. 1:12 shooters will want to go with lighter bullets. 1:7 or 1:6 shooters will want to look for heavier bullets.

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5.56x45mm Ammo Quick Facts

The 5.56x45mm ammunition is a higher pressure version of the civilian cartridge and generally cannot be used in bolt action rifles.
5.56x45mm nato ammo has been the standard round of the U.S. Military since 1963.
To find bulk 5.56x45mm nato ammo, use the "Sort By" toggle at the top of the page.
5.56x45 ammo is available from 55 to 77 grain bullet weights.

5.56x45 Ammo (AR-15)

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