Armor Level

Protection

PASGT

Fragmentation testing:  .22 caliber, 17 gr. FSP.  Minimum V50:  610 m/s (2000 ft/s)

ACH, ACH Gen II

8 g (124 gr) 9 mm FMJ RN at a velocity of 426.7 m/s + 15.3 m/s (1400 ft/s + 50 ft/s)

Fragmentation testing — 

2 grain right circular cylinder.  Minimum V50: 1280 m/s (4200 ft/s)

4 grain RCC.  Minimum V50: 1059 m/s (3475 ft/s)

16 grain RCC.  Minimum V50: 754 m/s (2475 ft/s)

64 grain RCC.  Minimum V50: 533.5 m/s (1750 ft/s)

.22 caliber, 17 grain FSP.  Minimum V50:  670.5 m/s (2200 ft/s)

ECH

8 g (124 gr) 9 mm FMJ RN at a velocity of 426.7 m/s + 15.3 m/s (1400 ft/s + 50 ft/s)

Fragmentation testing — 

2 grain right circular cylinder.  Minimum V50: 1728 m/s (5670 ft/s)

4 grain RCC.  Minimum V50: 1432 m/s (4700 ft/s)

16 grain RCC.  Minimum V50: 1018 m/s (3340 ft/s)

64 grain RCC.  Minimum V50: 719 m/s (2360 ft/s)

.22 caliber, 17 grain FSP.  Minimum V50:  905 m/s (2970 ft/s)

Additional: Classified “small arms threat” — presumed to be, based on the commercial availability of ECH-type helmets, 7.62x51mm NATO ball at a 200-300 meter standoff.

IHPS

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8 g (124 gr) 9 mm FMJ RN at a velocity of 426.7 m/s + 15.3 m/s (1400 ft/s + 50 ft/s)

Fragmentation testing — 

2 grain right circular cylinder.  Minimum V50: 1728 m/s (5670 ft/s)

4 grain RCC.  Minimum V50: 1432 m/s (4700 ft/s)

16 grain RCC.  Minimum V50: 1018 m/s (3340 ft/s)

64 grain RCC.  Minimum V50: 719 m/s (2360 ft/s)

.22 caliber, 17 grain FSP.  Minimum V50:  905 m/s (2970 ft/s)

Additional: Two classified small arms threats.  One at a minimum 1300 fps V50, the other at a classified velocity, though presumably quite similar to the ECH.