Hornady Black 5.56x45mm NATO 75-Grain InterLock Heavy Duty ammunition (part no. 81296) is loaded with a bullet chosen specifically for how AR-platform shooters actually run their rifles today. Hornady‘s Black line selects the best bullet option for each caliber and application, delivering accuracy and performance whether the rifle is suppressed or unsuppressed, supersonic or subsonic, and running a rifle, mid-length, carbine, or pistol gas system. The InterLock ring inside the jacket locks core to jacket for controlled, reliable expansion. This rifle ammunition is built for range training and duty-style use in an AR-15 platform.

Key Specifications

• The caliber is 5.56x45mm NATO, chambering interchangeably in 5.56 and .223 Remington rifles.
• The bullet weighs 75 grains, a heavier-for-caliber option that holds velocity well at distance.
• The bullet uses Hornady’s InterLock design, with a ring molded into the jacket that locks it to the core.
• Hornady markets this under its Black line, optimized across suppressed and unsuppressed AR platforms.
• The Heavy Duty designation reflects a bullet built for reliable performance under demanding use.
• The case material is brass, standard for reliable chambering and extraction.
• Each box holds 20 rounds, a practical count for a range or training session.
• Cost runs about $1.26 per round, pricing typical of a purpose-engineered AR-platform load.
• Ten boxes ship per case (200 rounds total), a bulk option for dealers and high-volume shooters.

Frequently Asked Questions

Is this round suited to a suppressed AR-15? Yes, Hornady’s Black line is engineered with bullet selection optimized across suppressed and unsuppressed use on rifle, mid-length, carbine, and pistol gas systems.

What does the InterLock design do? A ring molded into the bullet’s jacket locks it to the core, keeping the two from separating on impact for more controlled expansion.

Is 75 grains heavy for 5.56? It’s on the heavier end for the caliber, which helps the bullet retain velocity and energy better at extended range than lighter, faster options.

Buy Hornady Black 5.56x45mm NATO 75gr Ammunition

An AR-15 that runs suppressed one day and unsuppressed the next needs ammunition engineered for both, and Black is built specifically to cover that range. Order it from our Lubbock, Texas gun shop and it ships fast to your door.