Armor & Ballistic
Rating Reference
NIJ protection levels, plate materials, carrier types, and weight tradeoffs explained — with real threat context for each rating level. Selection guidance only, not a recommendation to purchase or rely on any specific product for personal safety.
| NIJ Level | Defeats | Does NOT Defeat | Type | Common Use |
|---|---|---|---|---|
| Level IIA | 9mm FMJ (1,225 fps), .40 S&W FMJ (1,155 fps) | High-velocity handgun, all rifle threats | Soft armor | Lightweight concealed wear; undercover LE; minimal-profile civilian |
| Level II | 9mm FMJ (1,305 fps), .357 Mag JSP (1,430 fps) | .44 Mag, all rifle threats | Soft armor | Standard LE patrol vest; most common duty soft armor level |
| Level IIIA | .357 SIG (1,470 fps), .44 Mag SJHP (1,430 fps) | All rifle threats | Soft armor | Maximum handgun protection; LE/security; concealed or external |
| Level III | 7.62×51 NATO M80 FMJ (2,780 fps), 6 rounds | M855A1 (steel core), .30-06 AP, .300 Win Mag | Hard plate | Rifle-rated plate; military, LE tactical, civilian preparedness |
| Level III+ (non-NIJ) | Level III threats PLUS M855/M855A1, M193 at velocity | AP rifle (.30-06 M2 AP), .338 Lapua | Hard plate | Industry designation (not official NIJ); addresses 5.56 steel-core gap |
| Level IV | .30-06 M2 AP (2,880 fps), 1 round | Multiple AP hits in same location; .50 BMG | Hard plate | Maximum NIJ rifle protection; single AP hit rated; heaviest plates |
III+ is not an NIJ designation. It is an industry marketing term for plates that exceed Level III testing (particularly against M855 and M193) but have not been tested to Level IV standards. Always check the manufacturer's actual test data and threat list rather than relying on the "III+" label alone.
| Material | Weight (10×12 SAPI) | Thickness | Multi-Hit | Pros | Cons |
|---|---|---|---|---|---|
| AR500 Steel | 8–10 lb | ~0.25–0.3" | Excellent | Cheapest rifle plate; extreme multi-hit durability; no shelf life | Heaviest option; spall risk (needs build-up coat or spall liner); thick profile |
| Ceramic (alumina/silicon carbide) | 5–7 lb | ~0.8–1.1" | Good (rated for 6 hits at III) | Lighter than steel; defeats AP threats at Level IV; standard military plate | Fragile if dropped; limited shelf life (5–10 years); degraded by moisture |
| UHMWPE (Polyethylene) | 3–5 lb | ~1.0–1.3" | Good | Lightest rifle plate; buoyant; no spall; comfortable for extended wear | Thick profile; heat-sensitive (can deform above 150°F); will not stop steel-core AP |
| Ceramic + PE Composite | 4–6 lb | ~0.9–1.1" | Good | Best weight-to-protection ratio; common in III+ and IV plates | Higher cost; ceramic face still vulnerable to impact damage |
| Pressed Steel (AR600+) | 7–9 lb | ~0.2–0.25" | Excellent | Thinner than AR500; better multi-hit; some models stop M855 | Still heavy; still requires anti-spall treatment; premium over AR500 |
Minimal external MOLLE or pouches. Designed to wear under clothing or with a low-visibility profile. Typical for plainclothes LE, executive protection, and civilian concealed wear. Usually paired with soft armor (IIIA) or thin hard plates.
Full MOLLE coverage, cummerbund, and admin/GP pouches. The standard military and LE tactical plate carrier. Designed for external wear over clothing with rifle plates. Brands: Crye Precision JPC, Velocity Systems Scarab, Spiritus LV-119, Shaw Concepts.
Full armor carrier with integrated magazine pouches, hydration, and comms routing. Used for military sustained operations, extended patrol, and heavy loadout roles. Heavier and hotter but distributes weight better with proper setup. Examples: Crye SPC, LBT 6094, Eagle CIRAS.
Proper plate sizing covers the vital organs (heart, lungs, major vessels) without restricting mobility. The plate should cover from the sternal notch (top of sternum) to approximately 2–3 inches above the navel, and span between the nipple lines. Larger is not better — oversized plates restrict arm movement and add unnecessary weight.
| Size | Dimensions | Fits |
|---|---|---|
| Small (SAPI) | 8.75" × 11.75" | Smaller frames; chest <37" |
| Medium (SAPI) | 9.5" × 12.5" | Most adults; chest 37–41" |
| Large (SAPI) | 10.25" × 13.25" | Larger frames; chest 41–45" |
| 10×12 (Shooter Cut) | 10" × 12" | Most common commercial size; fits most carriers |
| 11×14 | 11" × 14" | XL frames; provides more coverage at weight cost |
Plate cut matters: "Shooter cut" (also called SAPI cut) has clipped top corners for shoulder mobility. "Swimmer cut" has even more aggressive corner cuts for overhead arm movement. "Square cut" (full cut) maximizes coverage area. Most tactical users prefer shooter cut for the mobility balance.
| Threat | Caliber / Load | Approximate Velocity | Minimum Armor Level |
|---|---|---|---|
| 9mm FMJ (standard) | 9mm 124gr FMJ | ~1,165 fps | Level IIA |
| 9mm +P | 9mm 124gr +P | ~1,250 fps | Level II |
| .44 Magnum | .44 Mag 240gr SJHP | ~1,430 fps | Level IIIA |
| 5.56 M193 | 55gr FMJ | ~3,240 fps | Level III (some PE fail; verify) |
| 5.56 M855 | 62gr steel-core | ~3,020 fps | Level III+ (not all III stops M855) |
| 7.62 M80 Ball | 147gr FMJ | ~2,780 fps | Level III |
| .30-06 M2 AP | 166gr AP | ~2,880 fps | Level IV only |
M855 gap: Some Level III plates — particularly standalone UHMWPE plates — may NOT stop M855 (green tip) or M193 at muzzle velocity due to the steel penetrator or high velocity. This is the primary reason "Level III+" exists as a market category. Always verify the manufacturer's specific threat list against M855 and M193 if 5.56 protection matters to you.
