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 |