H&K Mark 23 .45 ACP 5.87in Threaded 12rd OD Green
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Specs at a glance
About this product
The Heckler & Koch Mark 23 .45 ACP 5.87in Threaded 12rd OD Green is a serious piece of hardware built for shooters who demand match-grade accuracy and absolute reliability. This full-size semi-auto handgun was developed alongside U.S. special operations, and it shows in every detail—from the 5.87-inch threaded polygonal barrel to the OD Green polymer frame with an integrated accessory rail. It ships with two 12-round magazines and a hard case, ready for the range or duty belt.
| Manufacturer | Heckler & Koch |
|---|---|
| Model | Mark 23 |
| Caliber | .45 ACP |
| Barrel Length | 5.87 inches, threaded (polygonal rifling) |
| Capacity | 12+1 rounds |
| Frame Material | OD Green polymer with accessory rail |
| Slide Material | Black serrated steel |
| Overall Length | 9.72 inches |
| Height | 5.91 inches |
| Width | 1.42 inches |
| Weight (unloaded) | 41.6 oz (per manufacturer specs) |
| Sights | 3-dot, adjustable for windage |
| Condition | New |
Key Features
- Threaded Polygonal Barrel (5.87 in): This barrel is cold-hammer-forged with polygonal rifling, which means less bullet deformation, higher velocity, and easier cleaning. The threading lets you run a suppressor without a gunsmith.
- OD Green Polymer Frame with Accessory Rail: The frame is glass-reinforced and textured where your hand sits—no slip even with wet gloves. The rail fits standard lights and lasers for low-light work.
- Match-Grade Accuracy Out of the Box: Per H&K, this pistol is built to a tighter spec than standard service pistols. Many shooters report 2-inch groups at 25 yards with quality ammunition.
- Ambidextrous Controls: Slide stop, magazine release, and safety lever are all reachable from either side. Left-handed shooters don't have to adapt.
- Dual Recoil Spring Assembly: Reduces felt recoil and extends service life. The Mark 23 runs reliably with both standard-pressure and +P .45 ACP loads.
Who It's For
This handgun is for the shooter who wants a no-compromise .45 ACP for home defense, competition, or collecting. It fits experienced owners who appreciate German engineering and a proven track record. New gun owners who are serious about accuracy and durability will also appreciate the Mark 23's forgiving recoil and intuitive controls.
Pros & Cons
- Pros: Built-in match accuracy; suppressor-ready barrel; ambidextrous controls; legendary reliability; two 12-round magazines included.
- Cons: It's a large, heavy pistol—concealed carry is impractical for most people. The trigger pull is good but not as crisp as some aftermarket triggers.
Comparison
| Feature | H&K Mark 23 | Zev Technologies OZ9 | Geissele Automatics P80 |
|---|---|---|---|
| Caliber | .45 ACP | 9mm | 9mm |
| Barrel Length | 5.87 in (threaded) | 5.22 in | 4.49 in |
| Capacity | 12+1 | 17+1 | 15+1 |
| Frame Material | OD Green polymer | Black polymer | Black polymer |
| Price | $2,699 | $1,899 | $1,749 |
| Best For | Duty, suppressor host, precision | Competition, carry | Custom builds, range |
FAQ
Is the H&K Mark 23 compatible with standard .45 ACP suppressors?
Yes, the barrel is 5/8x24 threaded, which is the most common .45 ACP suppressor thread pitch. It works with cans like the SilencerCo Osprey 45 and Dead Air Ghost 45 without adapters.
What holsters fit the Mark 23 with an OD Green frame?
Most full-size holsters designed for the Mark 23 will fit, but you'll want to check the specific model. Safariland and Blackhawk make duty holsters that accommodate the accessory rail and threaded barrel. For concealment, look for custom Kydex options.
Does the Mark 23 require a break-in period?
Per H&K, the Mark 23 is tested before shipping, but many owners recommend 200-300 rounds of standard-pressure .45 ACP to ensure smooth function with your specific magazines and ammunition. After that, it runs reliably with +P loads.
Can I mount a red dot on the Mark 23?
The slide is not factory-milled for optics, but you can send it to a gunsmith for a red dot cut. Alternatively, some shooters use a dovetail mount for micro dots. The iron sights are adjustable for windage and work well for most range work.
This H&K Mark 23 .45 ACP is ready to ship from our shop. We've seen it perform in classes and on the range—it's a tank that shoots like a target pistol. If you want a .45 that will outlast you, this is it.
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Browse more: Semi Auto Handguns | H&K Pistols | .45 ACP Handguns
Last updated: April 2026