Gunsmith Bros.

13/02/2026

16/11/2025

18/06/2025

It’s been a while since our last custom build and we’re excited to show you this.

Remade Infinity Formula 5.1, went for a Bronze body with hairline finish, glow reflective polishing. Layered, rugged, a timeless appeal for a pistol. And I’m certain you’ll love the tailored subtle dark grey-black tone on sandblasted finish of the grip. Balanced with details.

The textured aluminum Infinity MarcoPocket grip is unexpectedly sticky, locked to my hands when test-firing it.

Tuned internal springs for more power. Faster recoil, louder sound and realistic touch . All done by our gunsmiths.

Available on 1st July, exclusively at gunsmithbrosairsoft.com

Before next release, enjoy.

07/06/2025

GSB Custom Build - "♾️Infinity Formula"
The Formula to Make Champion 🏆
Built and Tuned by Your Gunsmiths Behind the Scene💪🏻

05/05/2025

For so long, build customization has been limited to available parts and their color options you can find in stores. Sometimes, it’s either totally out of that style, or running out that color. Great builders apply coatings to get a color they can’t buy, but the trade-off is the metal’s vibrant texture and reflectivity.

Recently, a sophisticated Infinity collector from Taiwan was kind enough to share his taste in Infinity with us. He turned to GSB for a gloss green build. And here it is:–

𝐂𝐮𝐬𝐭𝐨𝐦 𝐈𝐧𝐟𝐢𝐧𝐢𝐭𝐲 𝐓𝐓𝐆 𝐎𝐩𝐞𝐧 - 𝐆𝐥𝐨𝐬𝐬 𝐆𝐫𝐞𝐞𝐧 𝐒𝐆𝐒(𝟒)

- Textured trigger and mag. release button with brushed and highly reflective polished surface
- Patterned sight mount bolts
- Textured thumb rest with highly reflective sandblasted surface
- Enhanced fade-resistant durability
- Universal red dot optic footprint, island barrel, openwork grip

It was a really difficult journey to create this Gloss Green SGS(4) build, but we’re grateful for his trust.

For builders seeking a unique solution, GSB is here to bring your ideas to life, with care, experience and expertise.