Custom Infinity Formula 5.1 Standard – Bronze

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.

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Meticulously prepared and tested by our gunsmiths. Everything you need, ready in a glance.

Compatibility
Recom. Setting
Specs

Available on backorder

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GSB ProArmer
  • 365-day coverage
  • Priority access to online technical assistance by our gunsmiths
  • Factory Repair*
  • 15% off discount on parts replacement
GSB BasicArmor
  • 365-day coverage
  • Online technical assistance by our gunsmiths*
No GSB Armor coverage
  • 14-day coverage
  • Online assembly assistance by our gunsmiths
  • Top questions, answered
When will I get my build?

You’ll get a final delivery date after you place your order. Delivery date is based on item availability and the shipping option you choose. For available product, typically within 10-14 calendar days.

What happens if my delivery goes missing, being held or is damaged?
  • In case of any problems with your delivery, we’ll be in direct contact with the carrier to investigate the condition as quickly as possible and keep you informed throughout the process.
  • We’ll make every effort to minimise the risk of customs delays. In case where the package being held by local customs, we’ll assist to provide necessary documentation, but you’ll need to handle direction communication as customs authorities typically require verification from the recipient.
  • We’ll ensure your parts are intact before dispatch. If you receive your order and find it damaged, we’ll assist you directly.
Is my build covered by warranty internationally?

Yes, your new build can be protected internationally by GSB ProArmor or BasicArmor.

Many shooters turned to GSB when they’re looking for technical assistance from experienced gunsmiths and manufacturer. Click here to learn more about GSB Armor.

Can I buy GSB Armor after a purchase?

Yes, GSB Armor coverage is available to buy when you purchase your new build, or up to 30 days after.

Product Features:

  • Gunsmith Bros Full Custom STI/SV/Limcat Open/standard Pistol
  • All major parts are manufactured and assembled by Gunsmith Bros, but also includes
    • PDI 6.03 Precision Barrel/Nineball laylax 6.00 Precison barrel 
    • Guarder Nylon Reinforced Nozzle 
    • Gunsmith Bros Custom Pistol Box
  • Materials
    • 6061 Aircraft grade aluminum
      • Slide
      • Guide plug
      • Charging handle
      • Magwell
      • Trigger
      • Piston
      • Compensator
      • Grip
      • Sight Mount (Universal Footprint, RTS2, RMR, Docter, etc.)
    • 7075 Aircraft grade aluminum
      • Lightweight BBU
      • Trigger box
      • Mid Frame
    • Steel/Stainless Steel
      • Outer barrel
      • Guide rod
      • Mag release
      • Sear
      • Valve knocker & disconnectors
      • Trigger ring
      • Trident
      • Safeties 
      • Hammer
      • Slide Stop
      • Fiber optic Front Sight
      • Recoil, hammer, nozzle return and internal springs
      • Hop up pressure arm
      • Front & Rear sight (for Standard)
    • Brass
      • Hop up chamber
  • This pistol is designed to 0.20 g BB with muzzle velocity >370 FPS but with kinetic energy less than 2J, using green gas.
  • A FPS test for every complete build will be conducted before shipping. Testing records will be tabulated in the official FPS test certificate.

 

Last updated: 29th June 2025.

Part Compatibility

Cautions for Use:

  • This custom build is assembled and tuned by our Gunsmiths. Our Gunsmiths tune the pistol having a good balance between recoil feedback and cycling speed. 
  • Further fine tuning is required on your end to fit your own preference. Feel free to contact us for information and specifics on tuning and maintenance. 

Recommend Settings:

  • We do not recommend using a nineball magazine lip (purple lip) upgrade with Edge/Gunsmodify/Rhino nozzles, as the lip would be in physical contact with the nozzle during cycling. 
  • For IPSC or other competition shooters, aluminum Hi-Capa grip is compatible with SV/STL holster or adjustable holster.

 

Last updated: 29th June 2025.