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Group Dispersion Testing

H.P.White Laboratory, Inc. conducted the tests, and is acknowledged as the leading privately owned laboratory engaged in small arms and ammunition research, development and testing.



H.P.White Laboratory, Inc.
3114 Scarboro Road
Street, Maryland 21154-1822
Telephone: (410) 838-6550
Facsimile: (410) 838-2802

13 July 1998
(HPWLI 7682-01A)

North American Arms, Inc.
2150 South 950 East
Provo, Utah 84606

Attention: Mr. Ken Friel

Dear Mr. Friel:

Your letter of 29 June 1998, and related telephone conversations, requested Group Dispersion Testing of seven NAA Handguns received on 1 July 1998 via United Parcel Service. You ultimately requested three groups for each handgun at each of three ranges (7 yards, 14 yards, and 21 yards), using commercial ammunition from our stock.

All testing was conducted on an indoor range at ambient conditions. The handguns were sequentially installed in a rigid firing mount. Paper targets were mounted at 7, 14, and 21 yards from the muzzle. Three 5-shot groups were fired from each handgun, and group size was measured using the method prescribed in Paragraph 16.01 of The Commonwealth of Massachusetts 940 CMR 16.00 HANDGUN SALES. When a handgun was capable of firing multiple cartidge types (.22 LR and .22 WMR) it was tested with .22 WMR ammunition. Table I provides a summary of the test results.

TABLE I. SUMMARY OF RESULTS
(NAA 5-Shot Dispersion)
  Mean Extreme Spread (in)
Model Serial Number Caliber 7.0 yards 14.0 yards 21.0 yards
NAA-22S S0630 .22 Short (a) 6.08 13.48 15.35
NAA-22LLR L012013 .22 LR (b) 3.23 5.98 8.21
NAA-22LR L012039 .22 LR (b) 1.92 4.46 6.00
NAA-22MSC E019131 .22 WMR (c) 2.19 4.40 6.75
NAA-22MC E019153 .22 WMR (c) 1.12 2.23 3.54
NAA-BWC R3042 .22 WMR (c) 1.75 3.58 4.85
NAA-32 Guardian AA7385 .32 ACP (d) 1.75 4.25 5.65

(a) Winchester 29 gr. Kopper Klad L/N ED33
(b) Winchester 40 gr. Kopper Klad L/N EC71
(c) Winchester 40.0 gr. JHP L/N ED51
(d) Winchester 71.0 gr. FMJ L/N 32GF01 34 109

Thank you for the opportunity to conduct these tests. The handguns will be retained in our armory pending your disposition instructions. If we may be of any further service, please do not hesitate to contact us.

Very truly yours,


H.P.White Laboratory, Inc.



Lester W. Roane

LWR/lt
enclosures



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