Rifle · 5.56x45 · 5.56 · M855 · XM193
5.56 NATO Ammo
The standard AR-15 / modern sporting rifle round.
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1 listing5.56 NATO First Breach 55gr FMJ 1000rd bulk
Checked$0.439/rd$439.00In stock
Shipping & the law: Ammunition can't ship everywhere. Some states and cities — including California, New York, Massachusetts, Connecticut, Illinois, and New Jersey — restrict or prohibit online 5.56 NATO sales, cap quantities, or require delivery to a licensed FFL or an age-verified adult. Always confirm your own state and local laws before ordering; checkout runs on UNUM's rails, which enforce shipping restrictions at the point of sale. Must be 21+ to purchase.
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About 5.56 NATO
5.56 NATO is the highest-volume rifle caliber in the country and the round the AR-15 was built around. It runs at higher pressure than .223 Remington — 5.56 chambers shoot both, but .223-only chambers should stick to .223. Bulk 5.56 pricing is the rifle-market bellwether.
Common bullet weights run 55, 62, 77 grain.