
STI GP6
Bottomline
The STI GP6 is a sleek, innovative pistol that is perfect for shooters who crave something different.

Looking for a pistol that’s not just another cookie-cutter option? Meet the STI GP6, a handgun with serious personality and a unique twist (literally, thanks to its rotary barrel).
In this review, we’ll break down what makes this gun a standout, from its smooth handling and sleek design to a few quirks that might make you think twice. Whether you’re just window shopping or looking for your next range buddy, this article’s got the goods to help you decide if the GP6 is worth the investment. Let’s get into it!
Table of Contents
Bottomline
The STI GP6 is a sleek, innovative pistol that is perfect for shooters who crave something different.
Pros
- Three interchangeable backstraps
- Front and rear cocking serrations
- Integrated tactical rails
- Textured side panels
- Ambidextrous controls
- Polymer frame
- High capacity
Cons
- Difficult disassembly
- Heavy
STI GP6 Specs
Caliber | Capacity | BBL | OAL | Height | Weight |
9mm | 16 | 4.25″ | 7.9″ | 5.3″ | 26.1 oz. |
STI GP6 Features
Front and Rear Cocking Serrations
The front and rear cocking serrations on the STI GP6 are designed to make slide manipulation a breeze, whether you’re cocking the pistol or clearing a jam. They’re a nice touch for shooters who value quick, reliable handling. However, not everyone is sold on them—some users feel the serrations could be a bit more aggressive, as they might not offer the same solid grip as other models, especially if your hands are sweaty or gloved. Still, they get the job done!
Ambidextrous Controls
The STI GP6’s ambidextrous controls are a win for both lefties and righties, offering thumb safeties, slide release, and a magazine release that works seamlessly no matter your dominant hand. It’s a thoughtful feature for versatility and comfort. However, the thumb safety levers can feel a bit narrow for some users, which might make quick disengagement a little tricky in high-pressure moments. While it’s a great addition overall, the design might not feel perfect for everyone.
Textured Side Panels

The STI GP6’s textured side panels aim to give you better control during firing, adding a touch of confidence to your grip. They’re designed to help you maintain stability, especially during rapid shots. However, some users might find the texture a bit too mild, which could result in a slightly slippery grip under heavy recoil or sweaty conditions. While they do offer some level of control, those who prefer a more aggressive texture might feel they fall a little short.
Interchangeable Backstraps
The STI GP6 offers a customizable grip with interchangeable backstraps, allowing users to find a size that best suits their hand and improves overall ergonomics. It’s a thoughtful feature for tailoring the pistol to your comfort and shooting style. However, not all backstraps fit perfectly, and some users report slight movement or a less secure feel. Additionally, the process of swapping backstraps can be a bit tricky for beginners, and the limited size options might not cater to everyone’s hand size.
Further reading: Ultimate Gun Reviews
Final Thoughts
The STI GP6 is a solid choice for shooters looking for a unique and versatile pistol with a European design and innovative features. We are impressed by its unique rotary barrel system and ambidextrous controls. It feels great in hand, and the performance is reliable enough to make it a solid contender for everyday use or range days.
That said, it’s not perfect. The grip texture could use a bit more bite, and the backstrap adjustments aren’t exactly user-friendly. But honestly, if you’re looking for something different with plenty of personality and solid functionality, the GP6 is definitely worth a closer look.
STI GP6 Score Card
Ergonomics | Comfortable hold and good control but heavy. | 1.7 |
Trigger | Reliable. | 4.5 |
Accuracy | Good accuracy. | 4 |
Quality | Constructed from high-quality materials. | 4 |
Value | Offers good features for the price. | 1.69 |
Overall | The STI GP6 is a sleek, innovative pistol that is perfect for shooters who crave something different. | 3.18 |
I have a gp6. It is my favorite gun for combat. I also purchased 3 20 round mags. Best stock trigger I have ever seen fits my hand best. It is actually a grand power k100. Unfortunately I bought it when STI imported it and paid an extra $200 just to have the STI logo on the slide. Century Arms now imports it. It can be had for $429 shipped, and the new frame has a better slide lock then the old trigger guard lock.
I have a gp6. It is my favorite gun for combat. I also purchased 3 20 round mags. Best stock trigger I have ever seen fits my hand best. It is actually a grand power k100. Unfortunately I bought it when STI imported it and paid an extra $200 just to have the STI logo on the slide. Century Arms now imports it. It can be had for $429 shipped, and the new frame has a better slide lock then the old trigger guard lock.