The Spartan Armor Systems AR500 Level III Leonidas Package pairs two Spartan Omega AR500 10" x 12" steel body armor plates with the Leonidas plate carrier — a Berry-compliant, fully adjustable tactical carrier built in 500D Cordura. The plates are cut from 0.25" thick lab-certified AR500 ballistic-grade steel sourced from USA steel mills and meet Level III rifle protection under NIJ Standard-0101.06. The Leonidas carrier accommodates 10" x 12" or 9.5" x 12.5" Medium ESAPI plates, accepts 5" x 11" side plates in its cummerbund, and fits sizes M through 4XL. Optional AR500 side plate pairs can be added at checkout.

Who this is for

• Home defenders and preparedness-minded civilians who want a complete rifle-rated armor setup without sourcing plates and a carrier separately.
• Security professionals and range instructors who need Level III coverage in a carrier large enough to fit a wide range of body types, M through 4XL.
• Budget-conscious buyers who want a proven AR500 steel platform with a five-year manufacturer warranty and the option to expand with side plates later.

Ballistic performance

The Spartan Omega AR500 plates are manufactured from 0.25" AR500 ballistic-grade steel certified in-lab and sourced exclusively from USA steel mills. At the base coat configuration, each 10" x 12" plate weighs 8 lbs 10 oz (3.91 kg) and sits at 0.25" (6.35 mm) thick. The Full Coat configuration — which applies a thicker protective coating over the strike face — brings each plate to 9 lbs 11 oz (4.41 kg) and 0.5"–0.6" (12.7–15.2 mm) total thickness. Both the Single Curve and Advanced Triple Curve (ATC) variants share the same weight and thickness figures.

These plates meet Level III rifle protection under NIJ Standard-0101.06, designed to defeat common intermediate rifle threats. The Shooters Cut geometry provides a higher shoulder clearance than a SAPI cut, allowing a fuller range of motion when shouldering a rifle or carbine.

Plate compatibility and cut geometry

Each plate ships in the Shooters Cut profile. The curve options — Single Curve and Advanced Triple Curve (ATC) — offer the same dimensional and weight specifications, so the choice comes down to fit preference against the torso. The Leonidas carrier is built around the 10" x 12" format and also accepts 9.5" x 12.5" Medium ESAPI plates, giving flexibility if you later swap to a different plate standard. Side plate pockets on the cummerbund accept 6" x 6" or 6" x 8" panels; the optional Spartan Omega AR500 side plates sized to fit those pockets can be added as a variant at checkout.

Leonidas plate carrier

The Leonidas is the predecessor to the Leonidas Legend carrier. It is built from 500D Cordura with an interior padded with airflow channels to manage heat during extended wear. The adjustable internal buckle system and fully removable cummerbund let you dial in fit across sizes M through 4XL. The cummerbund is designed to accommodate 5" x 11" side plates, and dedicated MOLLE side plate pouches fit 6" x 6" or 6" x 8" panels. PALS webbing runs across the carrier for accessory attachment, a YKK-zippered admin pouch is built in, and a rear drag handle is present for emergency extraction scenarios.

Specifications

Fit and carrier compatibility

The Leonidas carrier's adjustable internal buckle system and removable cummerbund work together to fit a wide range of torso sizes across M through 4XL. The PALS webbing accepts standard MOLLE-compatible accessories. For fit questions specific to your measurements, contact us before ordering.

Frequently asked questions

What does Level III mean and what rounds do these plates stop?

Level III is an NIJ designation under Standard-0101.06 for rifle-rated hard armor. These plates are designed to defeat common intermediate rifle threats at the threat parameters defined by NIJ 0101.06 Level III. They are not rated for Level IV armor-piercing rifle threats such as M2 AP.

What is the difference between the Base Coat and Full Coat configurations?

The Base Coat plate applies a thinner protective coating to the AR500 steel strike face, resulting in a plate that weighs 8 lbs 10 oz and measures 0.25" thick. The Full Coat configuration adds a substantially thicker coating layer, bringing each plate to 9 lbs 11 oz and 0.5"–0.6" thick. The Full Coat coating is designed to significantly reduce spall and fragmentation off the steel strike face.

What is the difference between Single Curve and Advanced Triple Curve (ATC)?

Single Curve plates bow along one axis to follow the natural curvature of the chest. Advanced Triple Curve (ATC) plates are contoured along multiple axes for a closer body fit, which can improve comfort and reduce plate shift during movement. Both options share identical weight and thickness specifications in this product line.

What is the difference between Shooters Cut and SAPI Cut?

Shooters Cut removes more material from the upper corners of the plate compared to a standard SAPI Cut, raising shoulder clearance so a rifle stock seats cleanly without the plate edge interfering. SAPI Cut follows the geometry standardized for military plate carriers. Both cuts are compatible with the Leonidas carrier.

Are the side plates included in this package?

No. Side plates shown in product images are not included in the base package. Optional Spartan Omega AR500 side plates are available as a separate add-on variant at checkout using the variant selector on the product page.

Can this package be shipped to my state?

This package cannot be shipped to New York or Connecticut due to state body armor restrictions. It is subject to US export regulations. Under 18 U.S.C. § 931, anyone with a federal felony conviction for a crime of violence is prohibited from purchasing or possessing body armor.