Which plug

One cable to one device. This page is the LINK USB-C plug, and it goes to a light.

LINK is Unity’s switching system, and the connector is an actual USB-C, not a proprietary interface under a USB-C name.

The plug seats at the Unity GASCAP, which is the tail cap this switch uses. The Surefire UE and DS00 do not take a USB-C lead, so a light already using one of those needs the Surefire plug version instead.

Activation

The button is momentary. The light is on while it is held and off when it is released.

Because the button is momentary, the light returns to dark whenever the hand comes off it, and there is no way to leave it on from the rail. Constant on is a separate act at the tail cap. Some people prefer that, and choose this switch for it.

Tail cap options

Constant on for a light is a function of the tail cap. The plug connection seats there, so a tail cap is required and this switch does not include one.

The GASCAP button is full size because the connection meets the cap from the side rather than the back, leaving the whole face to the button. That is a layout consequence, not a feature decision.

The GASCAP button controls the light only.

Cable

4.5″ and 7″, both available with the USB-C plug. Modlite notes the 4.5″ reaches the device from the top rail in most setups.

The switch is molded to the cable and the cable to the plug, so the length is fixed at purchase.

Where this sits in the line

Built from two single leads:

Two single leads is the configuration users most often miss: two devices under independent control, using two switches and two rail positions, or both switches in one dual SNAP mount. The dual lead covers two devices on one press. The AXON puts two devices under one hand on separate buttons, and its light button adds constant on at the rail for the light.

Full power

Older switches were built for 3, 6 and 9 volt lights. Cells moved to 18350, 18650 and 21700, and current draw moved with them. A switch built to the older standard does not pass the draw of current head technology. Modlite puts the typical loss at 15 to 20% of output.

The ModButton Lite passes it, so the light runs at full output. It mounts to a light already owned.

Mounting

All four mounts are alternatives to each other, not additions.

Placement

Twelve o’clock is common for a white light switch, reachable with the support hand thumb from most grips. Two and ten put it on the side of the rail, which is where a laser switch often goes once the light has taken twelve. Which side follows whether the shooter is left or right handed. Rail length and handguard diameter set what is reachable without changing grip.

Handguards vary. A Picatinny rail at twelve is close to universal. Some run Picatinny at twelve, three, six and nine. Some pair Picatinny at twelve with M-LOK on the other faces.

Two switches on one rail sit at some distance from each other. Separation helps with reaching for one and finding the other, and with catching one on gear. The guards raise the sides of the button and reduce the exposed face. A dual SNAP takes the other approach and holds both switches in one mount.

The switch mounts on either side of the rail, which changes the cable routing. Route the cable close to the rail to avoid snags and clear of barrel heat.

Construction

• Injection-molded plastic, fully potted, which solidifies the internals against connection loss and heat
• Rail clamp bolts torque to 5 in-lbs
• Patented Unity Tactical design
• Made in the USA

Specifications

• Configuration: single lead
• Plug: LINK USB-C
• Activation: momentary
• Cable: 4.5″ or 7″
• Mounting: M1913 Picatinny rail, M-LOK with the adapter
• Mounting side: left or right
• Color: Black or FDE
• Includes: switch, Picatinny rail clamps, hardware
• Tail cap: not included

Complete your setup

Sold separately.

• Unity GASCAP tail cap, the USB-C tail cap this switch connects through
• Guards
• SNAP adapter, single or dual
• M-LOK adapter

About

The ModButton Lite is a patented Unity Tactical design, built to pass the current high-output heads require. Modlite builds weapon lights and handhelds for professional use, made and assembled in the USA.

Availability

Ships in 1 to 3 days.