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A .45 GAP cartridge.
|Place of origin||
|Case type||Rimless, straight|
|Bullet diameter||.451 in (11.5 mm)|
|Case length||.755 in (19.2 mm)|
|Overall length||1.070 in (27.2 mm)|
|Primer type||Small pistol|
|Maximum pressure||23,000 psi (160 MPa)|
Test barrel length: 4.49 in|
Source(s): DoubleTap Ammo
The .45 GAP (often called the .45 "GAP" or .45 Glock Auto Pistol) pistol cartridge was designed by Ernest Durham, an engineer with CCI/Speer, at the request of firearms manufacturer Glock to provide a cartridge that would equal the power of the .45 ACP, have a stronger case head to reduce the possibility of case neck blowouts, and be shorter to fit in a more compact handgun. GAP is an acronym for "Glock Automatic Pistol", and the .45 GAP is the first commercially introduced cartridge identified with Glock.
The .45 GAP has the same diameter as the .45 ACP pistol cartridge but is slightly shorter, and uses a small-pistol primer instead of the large-pistol primer most commonly used in .45 ACP ammunition. Originally, the maximum bullet weight of the .45 GAP was 200 grains (13 g). In order to provide terminal ballistics that matched the standard 230-grain (15 g) .45 ACP loads, the .45 GAP was designed to operate at a higher standard pressure—roughly equivalent to the higher pressures found in .45 ACP "+P" rounds. Since the .45 GAP has a much smaller cartridge volume than the .45 ACP, the desired pressure and resulting velocity needed to be achieved through powder selection alone. Later development concluded that the .45 GAP could also fire 230-grain (15 g) projectiles as does the .45 ACP.
Glock .45 GAP pistols
The full-size Glock 37 pistol was introduced by Glock to use the .45 GAP cartridge and was followed by the compact Glock 38 and the subcompact Glock 39. Glock's .45 GAP sized pistols use the same frame as their 9×19mm/.40 S&W/.357 SIG line of pistols. The slide is slightly wider to accommodate the larger diameter .45 cal round and is flush with the frame. Magazines for the .45 GAP are of the same dimensions as those that the 9×19mm/.40 S&W/.357 SIG line of pistols use.
Law enforcement application
Three state law enforcement agencies have adopted the .45 GAP as a replacement for their current issue 9×19mm Parabellum (New York) or .40 S&W service handguns ( South Carolina, and Florida). The New York State Police, South Carolina Highway Patrol, and Florida Highway Patrol have all adopted the Glock 37 and .45 GAP
Smaller agencies also applied the .45 GAP for duty carry such as the Burden, Kansas Police Department who carry the Glock 37 and serve a town of 535. The Greenville, North Carolina Police Department used the Glock 37, and the Berkeley, Missouri Police Department also used the Glock 37 to name a few.
Initially, due to its acceptance by law enforcement and the popularity of subcompact handguns for concealed carry, a small number of manufacturers decided to produce pistols that were chambered in .45 GAP, but they no longer produce any pistols in that caliber. Only Glock and Bond Arms continues to manufacture pistols in the 45 GAP cartridge. Springfield Armory did make the XD Series (HS2000) in .45 GAP but discontinued the caliber for that pistol line up.
The Pennsylvania State Police also carried the Glock 37, but have replaced them with the Sig Sauer P227 in .45 ACP due to underperformance in critical situations.
- .45 Super
- .44 Magnum
- 10mm Auto
- 11 mm caliber
- List of firearms
- List of handgun cartridges
- List of rifle cartridges
- Table of handgun and rifle cartridges
- "DoubleTap Ammo .45 GAP page". Archived from the original on 2009-06-20. Retrieved 2009-06-18.
- Unique Gen 4 Glock in .45 GAP for Florida Highway Patrol
|Wikimedia Commons has media related to .45 GAP.|