Difference Between 45 ACP and 45 GAP Pistols (With Table)

wPistols are nothing but a handgun. Pistols originated in the 16th century, and they are designed to fire bullets. It may have one or more barrels and can be held in one hand. Pistols are used by law enforcers worldwide. Not only do cops use pistols, but also terrorists and other types of criminals use this weapon to endanger people. 45 ACP and 45 GAP are the most popular pistols. The expansion of ACP and GAP is Automatic Colt Pistol and Glock Automatic Pistol.

45 ACP vs 45 GAP Pistols

The main difference between 45 ACP and 45 GAP Pistols is that, the size of the pistol. 45 ACP pistol is slightly bigger than 45 GAP pistol. Even though both of these pistols use different calibres, the diameter of the bullets for these pistols is the same. On the other hand, 45 ACP has much more grip than 45 GAP pistol.

45 ACP pistol is cheaper and well known for its grip. It performs well. The penetration caused by the 45 ACP pistol is deep due to the large size of the cartridge. It is one of the most popular and effective models of pistols. Its functioning is outstanding. This type of pistol is more popular among the army.

45 GAP pistols are not recommended for beginners since the cartridges in them are small. 45 GAP pistol has more pressure and needs a harder casing. It is also very expensive than 45 ACP pistols. Undercover cops are secret agents, actively use this type of pistol since it’s small and easier to carry. It is even popular among women because it has a small grip and is easy to use.

Comparison Table Between 45 ACP and 45 GAP Pistols

Parameters of comparison45 ACP45 GAP
Full formACP stands for Automatic Colt PistolGAP stands for Glock Automatic Pistol
Origin45 ACP was invented in 1905 by John Moses Browning45 GAP is designed by Ernest Durham in 2003
Place of origin It is originated in the United States45 GAP is originated in Austria, United States
PressureIt operates at 21,000 psiThis type of pistol operates at 23,000 psi
Grip45 ACP has a bigger grip45 GAP has a tiny grip

What is 45 ACP?

The full form of ACP is Automatic Colt Pistol. It is a common type of weapon used worldwide by law enforcement officers. This type of pistol has a bigger grip when compared to 45 GAP. 45 ACP is much cheaper since there are some downsides when compared to 45 GAP. 45 ACP is rimless and uses a 230-grain bullet.

45 ACP cartridges are very effective since it has the power to penetrate the tissues deeply and damage the central nervous system; it will incapacitate the target because the bullet will transfer all the kinetic energy to the target. But there are some downsides for 45 ACP. The cartridge is large, and the weight of it is heavy as well.

Overall, it is a powerful, effective weapon and won’t dissatisfy the user. An interesting fact is that this pistol had been used during world wars by the united states military as a sidearm. It is popular among sports shooters and the army.

What is 45 GAP?

45 GAP is Glock Automatic Pistol. It is a famous type of pistol, which is small and has a thin grip. This is often used by secret agents and underground cops. But, 45 GAP is a little more expensive and contains expensive cartridges. It even operates at a higher pressure and needs a harder casing to avoid the explosion of its barrel due to high pressure.

According to pistol experts and users, 45 GAP is an attractive pistol with advanced features. The 45 GAP bullets are more accelerated and have much energy since the inside of the barrel possess a high amount of pressure. This type of pistol has smaller ammunition as well.

45 GAP is designed by Ernest Durham in 2003. It has a rimless, straight case and operates at 23,000 psi. Even though it is most popular, it is difficult to find this pistol since many manufacturers don’t create this pistol. The maximum weight of a bullet is 200 grains.

Main Differences Between 45 ACP and 45 GAP Pistols

  1. 45 ACP was designed in 1904 by John Moses Browning. Whereas 45 GAP is designed by Ernest Durham in 2003.
  2. 45 ACP is larger. Whereas, 45 GAP is smaller in size and easy to carry
  3. 45 ACP operates at 23000 psi, and 45 GAP operates at 21,000 psi
  4. The full form of 45 ACP is Automatic Colt Pistol and 45 GAP is Glock Automatic Pistol
  5. 45 ACP is cheaper and 45 GAP is much more expensive


45 ACP and GAP pistols have lots of similarities and differences as well. These are the most popular pistols used by law enforcement officers. These pistols are effective in decapacitating the target. ACP pistol is a rimless straight handgun that is used by shooters and army officers.

45 GAP is smaller and more accessible to use. Since it is smaller in size, it is widely used by undercover agents. It is even attractive. Both 45 ACP and GAP pistols use the same calibre. The GAP pistol has a very tiny grip whereas ACP pistols have a larger grip. An interesting fact is that GAP pistols are rare to find since it is expensive and has a low manufacturing rate. But, 45 ACP is greatly available.

Even though both 45 ACP and 45 GAP has the same bullet diameters, the two cartridges aren’t interchangeable. The cartridge is shorter in 45 GAP than 45 ACP. Both pistols are designed by expert firearm designers and, these are effective pistols.


  1. https://www.ncjrs.gov/App/abstractdb/AbstractDBDetails.aspx?id=204547
  2. https://www.ojp.gov/library/abstracts/springfield-armory-xd-45acp