The Aguila 5.56mm NATO 55-grain Full Metal Jacket (Aguila part no. 1E556155) is a dependable, military-grade-spec range and training round from Aguila, a major Mexican ammunition manufacturer with decades of experience supplying both commercial and military customers. At 55 grains, this is the classic, most common bullet weight for 5.56 NATO, giving reliable function across virtually any AR-15-pattern rifle. Running at a genuinely fast 3,164 fps, it delivers a flat trajectory suited to both range training and general-purpose shooting. This is straightforward, reliable ammunition built for volume shooting rather than a specialty defensive or hunting role.

Key Specifications

• Chambered in .223 Rem/5.56 NATO, and built to feed reliably in any AR-15-pattern rifle.
• The 55-grain bullet weight is the classic, most common weight for this cartridge.
• Bullet construction is Full Metal Jacket (FMJ), built for reliable feeding and function rather than expansion.
• Muzzle velocity is rated at 3,164 fps, a genuinely fast, flat-shooting load.
• Cases are brass, standard for reloading and reliable ignition.
• It ships 30 rounds to a box, a slightly larger count than the more common 20-round box.
• Cost works out to about $0.58 per round, competitive pricing for brass-cased 5.56 ammunition.
• Aguila supplies both commercial and military customers, and this load is built to the same consistent standard across both markets.
• As standard FMJ, it’s built for reliable feeding and range use rather than hunting or defensive expansion.

Frequently Asked Questions

Will this bullet expand? No — it’s a full metal jacket bullet, built for reliable feeding and range use rather than expansion.

How many rounds come in a box? Each box holds 30 rounds.

What is this ammunition best suited for? It’s a dependable range and training round for AR-15-pattern rifles, not a specialty hunting or defensive load.

Buy the Aguila 5.56mm NATO 55gr FMJ

For AR-15 shooters who want dependable range ammunition without paying a premium, Aguila delivers consistent quality at a fair price. Order it from our Aguila Ammunition lineup at our Lubbock, Texas gun shop and it ships fast to your door, or browse the full rifle ammunition selection for more 5.56 range loads.