Shop for AR 15 Ammo online at GunBroker.com

When it comes to AR 15 ammo sales, GunBroker.com, the world's largest online auction site dedicated to firearms, hunting, shooting and accessories, is the place to be. We aim to provide you with all the necessary information you need to make an informed AR 15 ammo purchase. Explore the history, technical specifications, ballistics and background of AR 15 ammo, then browse the listings of our trusted sellers to make your purchase.

Hold your horses; we’ve got plenty more to offer. Check out our registered sellers' huge inventory of AR 15 ammo from a wide variety of manufacturers, including Magpul and Hornady.

Choosing the right AR 15 ammo

If you’re shopping here, you’re probably familiar with the chamber your AR 15 has and what ammo it needs, but surprisingly, many shooters believe all AR 15 ammo can be loaded into their rifle. This can lead to blown primers, case-ejection failure and cracked receivers. The best AR 15 ammo depends on what type of chamber your rifle has, so we’re going to cover the most common.

The .223 Remington is the most common AR 15 chamber. They are chrome-lined, smaller and tighter according to SAAMI (Sporting Arms and Ammunition Manufacturers Institute) specs. These are not to be confused with .223 Match chambers, which rifles slower and reduces the risk of spilling unspent powder.

The 5.56 Mil-Spec chamber is chrome lined and larger because the AR 15 ammo is loaded hotter and accommodates higher chamber pressure. It has a longer throat than the .223 chamber and can safely handle both 5.56 NATO ammo and .223 ammo.

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