5.56x45mm NATO is the standard chambering for AR-15 platform rifles and one of the most in-demand centerfire calibers we carry. It’s a favorite for range training, home defense, and competition thanks to its low recoil, affordability, and wide availability of bullet weights and styles — from bulk 55 grain FMJ practice ammo to heavier 77 grain open-tip match loads built for precision.
Looking for something specific? We stock everything from budget-friendly plinking ammo to premium match-grade loads like the IMI Razor Core 77gr OTM, a standout pick for shooters who want serious accuracy out of an AR platform. Also compare our 223 Remington and 300 AAC Blackout selections, or browse our full rifle ammo catalog.
Aguila 5.56x45mm NATO Ammo 55 Grain Full Metal Jacket Battle Pack
Aguila 5.56x45mm NATO Ammo 55 Grain Full Metal Jacket Battle Pack — 55 grain, in stock and ready to ship from Liberty Ammo Supply.
Atomic Ammunition Tactical Cycling Subsonic 5.56x45mm NATO Ammo 112 Grain Jacketed Soft Point Box of 50
Barnes VOR-TX 5.56x45mm NATO Ammo 70 Grain Barnes Triple-Shock X Solid Hollow Point Lead Free
Black Hills 5.56x45mm NATO Ammo 77 Grain Open Tip Match
Federal American Eagle M193 5.56x45mm NATO Ammo 55 Grain Full Metal Jacket
Federal American Eagle M193 ammo brings genuine mil-spec ball ammunition from one of the industry’s most trusted names. This 55
Frontier Cartridge Military Grade 5.56x45mm NATO Ammo 55 Grain Hornady Match Jacketed Hollow Point
Frontier Cartridge Military Grade 5.56x45mm NATO Ammo 62 Grain Hornady FMJ Full Metal Jacket
Frontier Cartridge Military Grade 5.56x45mm NATO Ammo 62 Grain Hornady FMJ Full Metal Jacket — 62 grain, in stock and ready to ship from Liberty Ammo Supply.
Hornady Black 5.56x45mm NATO Ammo 62 Grain Full Metal Jacket
Hornady Black 5.56x45mm NATO Ammo 75 Grain Hornady Interlock Jacketed Soft Point
Hornady Outfitter 300 Weatherby Magnum Ammo – 180 Grain CX
IMI M193 5.56x45mm NATO Ammo 55 Grain Full Metal Jacket
IMI M193 5.56x45mm NATO Ammo 55 Grain Full Metal Jacket — 55 grain, in stock and ready to ship from Liberty Ammo Supply.
IMI M855 5.56x45mm NATO Ammo 62 Grain SS109 Penetrator Full Metal Jacket (FMJ)
IMI M855 5.56x45mm NATO Ammo 62 Grain SS109 Penetrator Full Metal Jacket (FMJ) — 62 grain, in stock and ready to ship from Liberty Ammo Supply.