Byrna level III+ hard PE / Polyethylene (UHMWPE), is fully tested by an independent lab and provides protection from firearms threats up to 7.62 x 51/.308 at 2780 ft/s at 15 meters.
LINK -
Byrna Level III+ Armor Plate - NIJ Lab Test Report
Product Specs:
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A stand-alone armor plate with the multi-strike capability
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Single curve and shooter’s cut
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Laminated Ultra High Molecular Weight Polyethylene (UHMWPE) hard plate
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Positive Buoyancy
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Covering: 600D nylon with edge padding
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Complies with Ballistic Resistance of Body Armor NIJ Standard-0101.06
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Weight: 4.6 Lbs
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Rated for up to six strikes from 7.62 x 51/.308 at 2780 ft/s at 15 meters
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5-year lifespan