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5.56x45mm NATO Ammo

22 products in stock

The 5.56x45mm NATO is the military-spec cousin of the .223 Remington and a common chambering in AR-15 pattern rifles. Listings cover the two classic service loads, the 55 grain M193 and the 62 grain M855 (SS109), plus heavier 69 and 77 grain match bullets from Black Hills and IMI, including Sierra MatchKing.

Winchester White Box, Federal American Eagle, PMC X-Tac and Frontier fill out the full metal jacket side, while G9 Defense and NovX offer solid copper and lead-free hollow points. Everything is sold in boxes, cans or bulk packs.

Showing 12 of 22 products

Frequently Asked Questions

Can I fire 5.56 NATO in a .223 Remington chamber?

Not unless the barrel is marked 5.56 NATO or for both. 5.56 loads can run at higher pressure than 223 Remington loads, so check your barrel marking and manual.

What is the difference between M193 and M855?

M193 is a 55 grain full metal jacket load. M855, also called SS109, is a 62 grain load with a steel tip insert in the bullet.

Why do heavier 69 and 77 grain bullets need a certain twist rate?

Longer, heavier bullets generally need a faster barrel twist, often 1:7, to stay stable. Check your rifle's twist rate before buying.