
The Heckler & Koch Mark 23 is a large-frame .45 ACP semi-automatic pistol developed for demanding service use. Its double-action and single-action operating system combines a deliberate first trigger pull with a lighter single-action follow-up, while the fixed 3-dot sights support practical target acquisition. The 5.87-inch polygonal barrel is threaded for a suppressor, and the polymer frame with interchangeable backstrap grip system helps provide a secure, adaptable hold. Match-grade accuracy and robust construction make the Mark 23 a substantial duty and range pistol.
Key features
- .45 ACP chambering with 10+1 capacity for service and range use
- Double-action and single-action operating system with manual safety and decocker
- 5.87-inch threaded polygonal barrel with 0.578x28 threads
- Fixed 3-dot sights for a clear, familiar sight picture
- Polymer frame with interchangeable backstrap grip system
- Blue/Black finish on the slide and frame components specified for this configuration
The Heckler & Koch Mark 23 combines service-grade durability, match-grade accuracy, and suppressor-ready functionality in a proven .45 ACP platform.
Buying a handgun online in Texas
Handguns ship to the Texas FFL dealer you name, and you must be 21 to take the transfer. The dealer completes Form 4473 and the NICS check, or may accept a current Texas License to Carry in its place. Since September 2021 a qualifying adult 21 or older can carry a holstered handgun without a license, and DPS still issues the LTC for reciprocity. Our Texas License to Carry guide explains both. General information, not legal advice; check the current Penal Code.



