US Cartridge 9mm 124gr TMJ refers to a specific type of ammunition produced by US Cartridge.

• “9mm” indicates the caliber of the ammunition, which is commonly used in handguns and submachine guns.
• “124gr” specifies the weight of the projectile in grains. In this case, it means the bullet weighs 124 grains.
• “TMJ” stands for Total Metal Jacket, which is a bullet design where the lead core is fully encased in a harder metal, typically copper or brass. TMJ bullets have the entire bullet covered in a metal jacket, including the base, which helps to reduce lead exposure and barrel fouling.

US Cartridge is a manufacturer known for producing ammunition with a focus on performance and quality. The 124-grain weight is a popular choice for 9mm ammunition and can provide good balance in terms of recoil control, accuracy, and terminal performance.

It’s important to ensure that the ammunition is compatible with your specific firearm and to follow the manufacturer’s recommendations for safe and proper usage. Additionally, be aware of and adhere to local laws and regulations regarding the purchase, possession, and use of ammunition.