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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.
.25 NAA | ||||||||
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![]() .25 NAA basic shape | ||||||||
Typ | Pistol | |||||||
Place of origin | Vereinigte Staaten | |||||||
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 | ||||||||
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Source(s): Cartridges of the World[1] |
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
editThe 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.
Einführung
editThe 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
editAccording 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
editReferences
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