The Mark-1 Project
The Mark-1 Project

5.56X45MM, 55GR, Mark-1 - 500CT

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You will receive: 500 Rounds of 5.56 55GR FMJ Brass Casing  + Ammo Can 

Experience the pinnacle of ammunition craftsmanship with Mark-1's 5.56x45mm 55gr cartridges. Precision-engineered for unparalleled performance.

Caliber5.56x45mm NATO Casing MaterialBrass Muzzle EnergyApproximately 1 , 211.3 ft-lbs 1,211.3 ft-lbs for a 55gr bullet traveling at 3,109 fps. ft-lbs Muzzle VelocityApproximately 3,109 fps when fired from a 24-inch barrel. FPS Powder TypeBall Powder Primer TypeBOXER Bullet TypeFULL METAL JACKET (FMJ) Grain Weight55 GRAINS Package Dimensions11.5X7.25X5.06 inches Package Weight12.8 lbs Packaging TypeAmmo Can Round Count Per Package500 rounds


As Promised: Transitioning to Excellence As part of our unwavering commitment to quality, we've made a significant change: We've stopped using ZSR cases and have upgraded to premium ARMSCOR BATCH cases for our MARK-1 5.56 ammunition.

Mark-1 5.56x45mm 55GR Ammo a product of unmatched precision, consistency, and reliability. Crafted for professionals and shooting enthusiasts alike, each cartridge promises performance that stands a class apart. With a meticulous manufacturing process and rigorous quality checks, our 5.56x45mm ammunition redefines excellence in ballistics. Whether you're engaging in sharpshooting, tactical training, or recreational shooting, trust Mark-1 to deliver the perfect shot every time.

Ammo Specs
5.56x45mm NATO
Casing Material
Muzzle Energy
Approximately 1 , 211.3 ft-lbs 1,211.3 ft-lbs for a 55gr bullet traveling at 3,109 fps.ft-lbs
Muzzle Velocity
Approximately 3,109 fps when fired from a 24-inch barrel. FPS
Powder Type
Ball Powder
Primer Type
Bullet Type
Grain Weight
Packaging Details
Package Dimensions
Package Weight
12.8 lbs
Packaging Type
  • Ammo Can
Round Count Per Package
500 rounds
Advanced Performance Metrics
Firearm Compatibility
Ensure your firearm is rated for 5.56mm before using it, AR-15/M16/M4 Platform Rifles, Ruger Mini-14, Steyr AUG, HK416, FN SCAR-L (MK 16), Sig Sauer SIG556, Tavor (IWI), CZ Bren 2, LWRC M6
Quality Assurance
Triple-checked using state-of-the-art technology to ensure each bullet meets our rigorous quality standards.
Expertly engineered for a balanced flight trajectory, our FMJ bullet maintains a true course to your target.
Minimized muzzle flash for discreet shooting, ideal for low-light conditions.
Optimized case and bullet design to ensure smooth feeding in semi-automatic firearms.
Manufactured under tight tolerances to ensure uniformity across rounds, resulting in repeatable performance shot after shot.
Barrier Penetration
Solid FMJ construction designed to maintain integrity even when encountering barriers.
Designed for a manageable and predictable recoil, enabling faster follow-up shots and improved shooting comfort.
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