Find your C Series setup

Choose your Zentron

Choose your model, or select Not sure.

Zentron model *

C35C Series clip-onC50C Series clip-onC50RC Series clip-onMEGA CQ25RMEGA requires dedicated mounts. Rusan and Smartclip adapters do not fit.Open MEGA guide → Other modelGet help identifying your setupNot sureGet help identifying your setup

Choose your mounting style

Clamp to the day optic, or mount on a long rail.

C Series mounting style

Scope-clamped modular adapterRequired 45 mm M45 × 0.75 Connector Ring + matched clampRail mountZT-AC02 + C Series riser · for long rails such as ARHelp me chooseGet a matched recommendation

Fitment details

Find your scope model or measure the outside housing.

The clamp fits the objective housing exterior.

Front view

Do not use the glass diameter or printed lens size.

Side view

Use the approved clamping area.

Not to scale. Confirm the clamping location.

Optical height and alignment

Optical height and alignment

Measure from the top of the Picatinny rail.

H1 — Day-optic centerline height
H2 — Thermal centerline height

Match optical centerlines and verify the optic and clip-on interfaces.

A scope-clamped clip-on follows the day optic's height; a rail riser is not automatically required.

Concept only, not to scale. Individual component offsets are unspecified.

Rusan official sizing reference ↗ Clamp sizing: catalogue page 5.

How will you find the outside diameter? *

Find my scopeChoose the brand and exact modelI have measured itEnter the exact measurementHelp me measureFind the correct clamping areaOptic not availableProvide the measurement later

Adapter system (optional)

Adapter system (optional)

Choose a modular system, or get help.

SmartclipDUAL SMART M45 ring + DS clampRusanMCR-M45P ring + MAR-FX clampHelp me chooseGet a matched recommendation

Use ZT-AC02 and match the day optic's optical height.

C Series rail riser *

1.5 in setupZT-AC0215C + ZT-AC02 · 38.10 mm optical height1.7 in setupZT-AC0217C + ZT-AC02 · 43.18 mm optical heightNot sureGet help with height and adapters

Requested optical heightChoose a setup to view its height.

Complete assembly: rail top to C Series optical axis. Match the day optic's centerline.

Continue for help choosing your adapter or rail mount.

Review your setup

Check your choices before continuing.

We will confirm compatibility before you order.

Fitment support, no marketing signup.