Skip to main content
Dictionary
Store
Blog
World
Help
Advertise
Chat
System Status
Information Collection Notice
Trademark Concerns
reCAPTCHA Privacy
Terms of Service
reCAPTCHA Terms
Privacy Policy
Accessibility
Report a Bug
Data Request
Contact Us
Security
DMCA
© 1999–2026 Urban Dictionary ®
Mugs
Tees
Hoodies
Pro Customization
Create unique products with your own words and definitions
Preview
Personalize Your Design
Your Word
Your Definition
0.40 calibur ammunition, Smith and Wesson, is a calibur of bullet becoming increasingly used by gun manufacturers. It was originally designed to have the stoping power of a 0.45cal ammo, with the smaller size of 9mm. The FBI held a series of tests looking for a new ammunition after it decided the 9mm did not have enough force for it's agents to quickly neutralize a target. It decided on the 10mm, which is a somewhat rare load, with only a few pistol makers such as Glock making pistols which utilize it. The FBI eventually settled on the 0.40cal, Glock 23, as standard issue for it's agents. The new round was more powerfull than 9mm, but was similar enough in size that the size and shape of a pistol can be the same as that of a 9mm and it can still hold sufficient rounds. Many times a person refering to a 40 cal is actually talking about the gun which uses this ammunition, rather than the ammo itself.
Text fits
Save
Cancel