.25 NAA
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| .25 NAA | ||||||||
|---|---|---|---|---|---|---|---|---|
 .25 NAA basic shape | ||||||||
| Type | Pistol | |||||||
| Place of origin | United States | |||||||
| Production history | ||||||||
| Designer | J.B. Wood | |||||||
| Designed | 1999 | |||||||
| Manufacturer | North American Arms | |||||||
| Produced | 2002–present | |||||||
| Specifications | ||||||||
| Parent case | None | |||||||
| Case type | Rimless, bottlenecked | |||||||
| Bullet diameter | .251 in (6.4 mm) | |||||||
| Neck diameter | .276 in (7.0 mm) | |||||||
| Shoulder diameter | .333 in (8.5 mm) | |||||||
| Base diameter | .337 in (8.6 mm) | |||||||
| Rim diameter | .337 in (8.6 mm) | |||||||
| Rim thickness | .046 in (1.2 mm) | |||||||
| Case length | .745 in (18.9 mm) | |||||||
| Overall length | .960 in (24.4 mm) | |||||||
| Case capacity | 9.75 gr H2O (0.632 cm3) | |||||||
| Rifling twist | 1 in 16 in (410 mm) | |||||||
| Primer type | Small Pistol | |||||||
| Maximum pressure | 23,000 psi (160 MPa) | |||||||
| Ballistic performance | ||||||||
| ||||||||
| Source(s): Cartridges of the World[1] | ||||||||
The .25 NAA is a pistol cartridge introduced by the North American Arms company in 2002. It was originally created for use in a smaller and lighter model of their Guardian pistol.
Despite popular belief, the 25 NAA cartridge is not based on the 32 ACP case. It is based on a rimless version of the .32 H&R case, shortened to .745" and necked down to accept .251-inch diameter (.25 ACP) bullets. The 32 ACP case, at only .680" long, is too short for use in 25 NAA production.
History and design
[edit]The cartridge was originally conceived of and prototyped by gunwriter J.B. Wood, and called the "25/32 JBW".
North American Arms and Cor-Bon Ammunition then further developed the cartridge, and the NAA Guardian .25 NAA pistol combination for production in consultation with Ed Sanow.
Introduction
[edit]The finalized cartridge and pistol were introduced at the 2004 SHOT Show.[2]
It followed the successful introduction of two other commercial bottleneck handgun cartridges, the .357 SIG in 1994 (which necked a .40 S&W case down to accept .355 caliber bullets); and the .400 Corbon in 1996 (which necked a .45 ACP case down to accept .40 caliber bullets).
Performance
[edit]According to NAA's website, the .25 NAA's 35 gr bullets travel faster (1,200 f.p.s.) and hit harder (20% more energy on average) than larger, .32 ACP caliber, bullets.
See also
[edit]References
[edit]- ^ Barnes, Frank C. (2006). Skinner, Stan (ed.). Cartridges of the World (11th ed.). Gun Digest Books. p. 288. ISBN 0-89689-297-2.
- ^ "25NAA Press Release" (Press release). North American Arms. Archived from the original on 2011-07-22. Retrieved 2018-11-26.
External links
[edit]
- "NAA Guardian Review". defensereview.com. Archived from the original on 27 September 2007.
- "Penetration test results". naaminis.com. Archived from the original on 2011-07-22. Retrieved 2018-11-26. at NAA website
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