H.P. White

To confirm its belief that it had built a superior firearm, Adcor Defense tasked H.P. White Laboratory to performance test the ADCOR A-556 ELITE™

H.P. White Laboratory is known as the leading small arms and ammunition research, development and testing laboratory in the U.S. It numbers among its clients, many branches of the U.S. military, the National Rifle Association (NRA), several firearms manufacturers and ammunition companies as well as global firms such as Caterpillar, GE Plastics, Chrysler Corporation, Goodyear Aerospace, Monsanto Chemical Co. and others.

The testing was done in conformance with abbreviated portions of the First Article Test Matrix, Carbine, 5.56mm, M4 type derived from MIL-C-71186 (AR).


  • In the function and casualty testing (6,000 rounds): Zero failures or stoppages.
  • In the dispersion testing, using a ADCOR A-556 ELITE™ with a 14.5” barrel, groupings were .88” at 100 yards.
  • Adverse environment testing: Buried in sand then fired with no malfunctions.
  • Completely submerged in water then fired with no malfunctions.


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