Geo 3.5 Paintball Marker

Geo 3.5 - Performance + Efficiency At Its Core!

There have been few upgrades to a markers drivetrain that have yielded such significant performance improvements as the IVCore brought to the Geo platform in GSL. The IVCore brought about not only a significant uplift in outright efficiency to the Geo, but also noted improvements in both feel and sound signature.

We took the IV Core implementation and made it available to a wider audience...

So overwhelmingly positive was the response to the implementation of the IVCores new breech-sensing technology in GSL that the next logical step was to make its benefits available to a much wider audience than just the 750 fortunate GSL owners.

So here we stand with the Geo3.5

The synthesis of the Geo3.1's style, aesthetics and ergonomics and the GSL's implementation of the IVCore drivetrain. Sleek and comfortable with the benefit of increased efficiency, quieter sound signature, softer shot and true pop-up tool-less bolt removal in one streamlined package.

The Geo platform has gained huge popularity amongst tournament and woodsball players alike. The Geo3.5 will help to press home its advantage to Speedball players with its minuscule amount of barrel rise even during ramping and its exceptional efficiency that gives them the ability to carry enough paint for the longest of matches or points. In the woods, the light weight of the Geo combines with its now even quieter sound signature to make it the perfect companion for those extended periods on the field and for taking those shots when you don’t want to give your position away.

Giving the User Control

Internally and externally the Geo3.5 utilizes the latest technologies developed by our engineers. The Electronics are fully adjustable via the on-board backlit LCD display and graphical user interface. Or if you prefer, with the optional ePortal kit you can connect the Geo3.5 to your laptop or home PC to adjust parameters, download latest versions of firmware or customize the graphics on the display.

Sleek and comfortable with the benefit of increased efficiency, quieter sound signature, softer shot and true pop-up tool-less bolt...

Mechanically, the Geo3.5 uses a Custom MAC solenoid valve system that drives the IVCore and controls the filling of the firing chamber. As with all other Geo3 versions the speed of the bolt is externally adjustable via a dial on the trigger guard. Selecting a slower bolt speed reduces shot signature and recoil resulting in a soft, quiet shot; where a higher bolt speed will allow devastating rates of fire. The Geo3.5 offers both these options and an infinite range between.

In fact the Geo3.5 is all about giving the user control. For example, there are magnetic and leaf spring trigger return mechanisms as well as micro switch and optical trigger sensing circuits to choose from. Both an all-metal multi-ported bolt and the latest full rubber-tipped anti-rollback bolt are included with the marker. With so many choices available as standard the user can quickly and easily tailor the feel and performance of the Geo3.5 to their specific requirements and preferences.

The Geo Legacy

The Geo3.5 continues the legacy of the AT Pipe system. First designed and implemented on the EgoLV1 and later ported over to the Geo line on the Geo3.1, the AT Pipe system removes the need for macroline from the POPS ASA to the inline regulator.

Instead air is transferred via the AT Pipe from the frame to the new SL4 inline regulator in a way that allows the marker to still be quickly and easily stripped, cleaned and maintained.

Of course every single Geo3.5 is constructed using the very best materials possible and meticulously hand built whilst undergoing rigorous inspection and testing at every stage. We do everything possible to ensure that each marker that leaves the facility is as close to perfection as possible.

But all of that is mere detail. It’s on the field where the Geo3.5 was designed to deliver. Not just a bunch of words on a spec sheet but a tool built to deliver devastating performance. A marker built to win.

Geo 3.5 Features

  • IVCore Drive Assembly
  • GSL-Style Quick Release Bolt Mechanism
  • Geo 3 Cure ST1 And ST2 Soft Tip Bolt Assemblies
  • LV1-Style Grip Frame and Grips
  • AT Pipe System
  • Gen 2 ISCIS (Innovative Solenoid Controlled Isolation System) Solenoid Valve
  • Integrated Body Filter
  • Bolt Speed Control System (BSC)
  • SL4 Inline Regulator - Works With Any Tank
  • E-Portal Compatible - Update Firmware, Splash Screens and User Settings
  • Shaft4 Barrel 14.5"/0.689"
  • Multicoloured Transflective LCD Module
  • Extended Grip Pitch - Increased Comfortable and Stability
  • Spool Valve Design
  • Low Reciprocating Mass - Bolt 17g
  • Tool-less Bolt removal - all internal bolt components removed without tools
  • BBSS (Break Beam Sensor System)
  • Def-Tek Offset Feed
  • C-Lever Clamping Feedneck with Sprocket Wheel
  • Dual Selectable Trigger Switching - Opto and Micro Switches
  • Dual Trigger Return Mechanisms - Spring and Magnetic Return
  • Integrated Audible Beeper for Alarms and Actuations
  • Capped and Uncapped Ramp Modes
  • All Major Tournament Presets
  • 9 Preset Debounce Modes
  • 5-Point Adjustable Trigger
  • POPS - On/Off/Purge ASA System

Geo 3.5 Specifications


Weight918g/2.02lb (inc Barrel,Battery,Feed,POPS)
Length540mm (inc Barrel)


Body6061-T6 Aluminium
Barrel6061-T6 Aluminium
Frame6061-T6 Aluminium
Feed6061-T6 Aluminium
Eye Covers6061-T6 Aluminium


Interface3 Button on frame with tourney lock on PCB
DisplayTransflective LCD w/ Tru-Color Adjustable backlite
Solenoid Voltage5v
Processor Voltage3v
Processor16-Bit 16 MIPS
Power Supply1 x 9v (PP3) Battery
EportalCompatible (sold separately)


Trigger MethodsMicro-switch and Break Beam opto-switch
Trigger MechanismCoil spring and magnetic return
Trigger PivotDual instrument ball race units mounted in bearing carrier
Barrel2-Piece Micro Honed Shaft4 14.5" length 0.689" Bore
Feed TubeLever operated Clamping Feed with Sprocket Thumb Wheel


Operating PrincipleSpool Valve
Solenoid TypeCustom MAC Solenid valve
Drive MechanismIV Core with quick-release back cap
Bolt MechanismSpool Cure ST1 and ST2 Bolts


Grip TypeContoured dual density grip
Grip Pitch172mm


Firing ModesSemi & Ramping capped and uncapped
Debounce Modes10 Debounce Modes

Geo 3.5 Featured Video

Geo 3.5 Styles

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    Ashes 3

  • /private/GEO35KJ74S8/styles/Charge-3.jpg

    Charge 3

  • /private/GEO35KJ74S8/styles/Combat-3.jpg

    Combat 3

  • /private/GEO35KJ74S8/styles/Haze-2.jpg

    Haze 2

  • /private/GEO35KJ74S8/styles/Kryptonice.jpg


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  • /private/GEO35KJ74S8/styles/Shiner-3.jpg

    Shiner 3

Featured styles are for illustration purposes only and are subject to manufacturing tolerances so the colours shown may vary from the actual production models. Please consult your Local Eclipse Dealer or Shop Online for the latest style options for this model.