The best

starts with

quality.

Custom Airsoft Pistol & Hi Capa Parts Manufacturer Since 2003.

Your Gunsmiths Behind The Scenes.

Trusted by Our Industry Since 2000s

Since the early 2000s, top airsoft brands like Modern and Airsoft Masterpiece have turned to GSB for innovative solutions, such as our integrated mid-frame center housing and fixed outer barrel designed for stock Tokyo Marui Hi-Capa pistols. Since then, these innovative parts have revolutionized airsoft pistol performance, delivering unmatched modifiability and performance.

Empowering Competitive Shooters & Industry Growth

Today, competitive shooters worldwide rely on GSB's precision parts to outshoot Level 3 competitions. We're deeply grateful for your support to keep our airsoft industry growing.

Quality drives every shot, and GSB is proud to power the industry’s best with our custom Hi-Capa airsoft pistol builds and parts. From competitions to daily practice, all backed by decades of gunsmith expertise.

Latest Builds

These are the new full-customized Hi-Capa airsoft pistols straight from the workshop. Respects to the original designs, infused with our gunsmiths' bold taste in color tone and pattern. Balanced configuration between appearance and functionality. Tuned internals and ready to shoot. Each one is wholeheartedly endorsed to be the signature of our craftsmanship.

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Design Your Dream Hi-Capa Airsoft Pistol with #GSB – Made in Hong Kong

With our gunsmiths’ expertise since 2003, we help your realize your dream design to life, with the quality it deserves.
True customization, inside and out.

Configure Yours Now

Tailor-made pattern

Personalized designs that balance functionality & stunning appearance

Tuned Internals

Adjustable internals, drop-in fit. Gunsmith's experience incorporated.

Electrochemical Coloring

32 processes, all done in-house. Durable, fade-resistant, highly reflective & smooth. No break-in required.

Proudly Made in Hong Kong

From raw metal block to final smooth finish, ensuring maximum quality control & precision. True value in every unique.

Your Gunsmith Behind the Scenes

Every single piece of our custom Hi-Capa airsoft pistols and parts is crafted by four experienced gunsmiths in Hong Kong, with the ultimate philosophy: seamless compatibility with Tokyo Marui Hi-Capa system, and precision crafted accuracy.

Artisanal Craftsmanship for Tokyo Marui Hi-Capa Airsoft Pistols

GSB's artisanal craftsmanship manifests to your eyes through the attention to detail, from the distinctive features of the original design to tuned internals for better performance and response, all done in-house by our gunsmiths' skilled hands since 2003.

This is a respect to the airsoft profession, because the finer we forge, the easier you hit Alpha, the fewer breakdowns, the more adrenaline on your airsoft journey.

Built Tough Hi-Capa Airsoft Pistols, Proven Over 20 Years

Reliability of our hi-capa airsoft pistol parts has been proven over 20 years in tough uses. You won’t break your build from a single drop. Veteran shooters report their builds function like yesterday after 4 years of use.

Artisanal Craftsmanship for Every Airsoft Pistol

Consistency of our hi-capa airsoft parts maintained by our founders, the gunsmith brothers. From measurement and design to manufacturing, polishing and fine-tuning, every step is done through their hands. Can you imagine that before our parts reaching your hand, they have been vetted one by one along its journey? Time has validated the dedication of the two gunsmith brothers.

Our value is right in front of you.

Countless shooters’ve seen GSB custom airsoft Hi-Capa builds operate smoothly, fit tightly, and function seamlessly. Behind them, it’s the gunsmith brothers' stiff-necked persistence in stringent manufacturing tolerances and details.

Designed to be best fit with Tokyo Marui

Compatibility with TM Hi-Capa is at the core of GSB designs. You won’t find products from GSB that are proprietarily bundled, unless its advantage is noticeable to you and has been verified scientifically. Save you time and money from trial & error.

Shooter-Centered Hi-Capa Airsoft Designs

We work quietly, focusing on every detail. You’ll feel it in every shot, even if we don’t say it.

Technical Sharing

Putting togther the perfect build can feel like a gamble. Dizzy choices, busily trying out. GSB's gunsmiths have been there, and they know how frustrating it can get when struggling in sorting out something truly fit.

Honest Insights for Hi-Capa Airsoft Pistol Maintenance & Tuning

Here are our honest insights you might need when you serving your hi-capa airsoft pistol at home. Data-backed sharing drawn from real-world testing and first-hand experience since 2003. No blowhard, no sales pitch.

Learn practical tips on tuning internals, regular maintenance and even race airsoft pistol building.

Technical Sharing by Gunsmith Bros Airsoft

About GB-01 and Tokyo Marui Hi-capa airsoft pistol tuning, maintenance, general guidance. No blowhard, no sales pitch. Prue technical, originated from the gunsmith of Gunsmith Bros.
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Shooter Favorites

Start building your own custom hi-capa airsoft pistol with a solid foundation. Trusted by other shooters, these hot sellers are essential parts for all levels from behinners to competitive shooters.

Essential Parts for Upgrading Your Hi-Capa Pistol

Our signature, like advanced mid-frame, precise outer barrel & metal grip for Tokyo Marui Hi-Capa, are designed for long-term use with superior durability and modifiability — perfect for competition or practice.

Click inside for more technical details on why they're must-haves.

Make Your Orders Online

GSB partners with fast, reliable worldwide shipping carriers for your custom Hi-Capa airsoft pistol builds and parts. Our dedicated staff will help you with customs issues ensuring a smooth delivery to shooters everywhere.

Directly From the OEM: Gunsmith Bros Airsoft

As the source, GSB delivers the best, quality Hi-Capa parts and custom airsoft pistols at the best value and availability. Here you can find limited and exclusive releases, plus the specific after-sales technical helps from our gunsmiths for the stuff we make.