America’s favorite cartridge, the 5.56 offers a wide range of loadings, proven performance, and a host of capable Springfield Armory firearms to fire them. Whether you want a rifle or a pistol, there’s a Springfield Armory firearm chambered for this round that’s ready for you.

5.56 NATO AR15 rifles for sale online or in-store at Sportsman's Warehouse. Shop a full selection of 5.56 NATO caliber AR15 rifles from top firearms manufacturers.

The 5.56mm Nato is a mid-sized rimless bottlenecked cartridge named for its use as the second standard service rifle cartridge for NATO forces in the 1980s. It was originally intended for the M16 and is often used in the AR-15, though it can also be used in many rifles from several of the top manufacturers in the business.

Get an AR-15 rifle that's optics-ready to attach a scope and has a longer barrel for increased bullet velocity. And if you just want something that looks cool at the range, our AR-15s for sale feature everything from tactical black to patriotic decals. Explore all of these and more in our massive collection of guns for sale!

Diamondback Firearms Carbon DB15 5.56 NATO AR-15 Rifle - Olive Drab Green - 30rd - 16"

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