Glock 37 pistols for sale online at Omaha Outdoors are chambered in the unique 45 GAP cartridge, allowing for a handgun almost exactly the same size as a Glock 17 but carrying ten rounds with the power of a 200 grain 45 caliber bullet. For many shooters, the excellent Glock 21 with its 13 round magazine capacity is simply too large to effectively hold and fire, especially one handed. Enter the 45 GAP, or 45 Glock Auto Pistol, slightly shorter than a 45 ACP cartridge in order to fit the smaller 9mm Glock frame.
Before the introduction of the Glock 37, few people were asking for a shortened 45 ACP cartridge that would fit a smaller or shorter frame handgun. Most were concerned with the diameter, not the length, of cartridges, and the last successful shortened cartridge was the 40 Smith & Wesson which came out of cutting a little more than a tenth of an inch off the 10mm Auto case. A similar case length difference separates the otherwise identical 357 Magnum and 38 Special cases, although in this example it was the shorter 38 Special that came first. With 45 GAP, though, the case is significantly different than 45 ACP. The Glock cartridge, designed by Speer/CCI, has a slightly rebated rim and uses a small pistol primer. Ammunition is not interchangable, and it's important to buy 45 GAP ammunition if you purchase a 45 GAP pistol. While the number of law enforcement agencies that have bought 45 GAP pistols is small, those that have made the switch report high levels of satisfaction both in terms of terminal effectiveness and “shootability.”