Military Wiki
.45 G.A.P.
45GAP Glock Automatic Pistol 002
A .45 GAP cartridge.
Type Pistol
Place of origin Flag of Austria Austria
Flag of the United States United States
Service history
In service 2003–present
Production history
Designer Ernest Durham
Designed November 2002
Manufacturer CCI/Speer
Produced 2003–present
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)
Ballistic performance
Bullet weight/type Velocity Energy
185 gr (12 g) Gold Dot JHP 1,150 ft/s (350 m/s) 543 ft·lbf (736 J)
200 gr (13 g) Gold Dot JHP 1,050 ft/s (320 m/s) 490 ft·lbf (660 J)
230 gr (15 g) Gold Dot JHP 935 ft/s (285 m/s) 447 ft·lbf (606 J)
230 gr (15 g) FMJ-FP 940 ft/s (290 m/s) 451 ft·lbf (611 J)
Test barrel length: 4.49 in
Source(s): DoubleTap Ammo[1]

The .45 G.A.P. (often called the .45 "GAP") 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 but was shorter to fit in a more compact handgun, and with a stronger case head to reduce the possibility of case neck blowouts. G.A.P. is an acronym for "Glock Automatic Pistol", and the .45 G.A.P. 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 on par with 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 in fact fire 230-grain (15 g) ammunition just as 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. The width of all three pistols is listed by the manufacturer as 1.18" wide, compared with 1.27" for the .45 ACP Glock 21 and Glock 30, indicating that Glock was able to not only shorten the front to back size of the grip, but also the grip width. Glock's .45 GAP sized pistols utilize the same frame as their 9mm/.40cal/.357SIG 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 the same dimensions as those used by the 9mm/.40/.357sig line of pistols.

Law enforcement application[]

Four state law enforcement agencies have adopted the .45 G.A.P. as a replacement to their current issue 9×19mm Parabellum (New York) or .40 S&W service handguns (Georgia, South Carolina, and Florida). The New York State Police, Pennsylvania State Police, Georgia State Patrol, South Carolina Highway Patrol, and Florida Highway Patrol[2] have all adopted the Glock 37 and .45 G.A.P.

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 chambered in .45 G.A.P., including some Para-Ordnance M1911s and the Springfield Armory XD. Para has since dropped the G.A.P. Springfield Armory's XD pistol is listed in several different 45 G.A.P. varieties on their web site but they no longer produce any pistols in that caliber. Only Glock continues to manufacture pistols in the 45 G.A.P. cartridge.

See also[]


  1. Republic of Égyptien Q42 user:mgbtrust0 ®™✓©§∆∆∆€¢£. "DoubleTap Ammo .45 GAP page". Archived from the original on 2009-06-20. Retrieved 2009-06-18. 
  2. Unique Gen 4 Glock in .45 GAP for Florida Highway Patrol

External links[]

All or a portion of this article consists of text from Wikipedia, and is therefore Creative Commons Licensed under GFDL.
The original article can be found at .45 GAP and the edit history here.