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What’s Included | Specs | Pictures | Restrictions | Related Info

The ROMEO4T-PRO is nearly identical to the 4XT, with the main difference being the battery. Instead of the low-slung AAA, the 4T-PRO runs off of a standard CR2032 coin cell. This smaller battery offers a slightly slimmer footprint and slight weight savings while maintaining a 50,000-hour battery life. The 4T-PRO offers several flip cover options, a killflash, and four swappable reticles. The included mount comes in at absolute height, but the included spacer can be installed to bring the optic up to a lower 1/3rd co-witness. Unlike the 4XT, the 4T-PRO also comes with a low mount, allowing it to be better used on platforms like the MP5 or AK74/47 that generally require lower optics.


  • Low Mount
  • Killflash
  • Clear Flip-Up Covers
  • Solid Flip-Up Cover (Front)
  • Rubber Bikini Lens Cover
  • Multi-Tool
  • T10 Torx Bits
  • Mount Spacer
  • Long Mount Screws
  • Cleaning Cloth
  • CR2032 Battery

We include an 8.5″ x 11″ rifle zero target with every red dot. We recommend a 50/200 meter zero for most 5.56 rifles. (Click on the thumbnail for a printable version.)
How to Zero in 2 Minutes – Video – T.REX ARMS

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  • Users can select from 4 different integrated reticle options (Dot, Circle-Dot, Dot with Holds, Circle-Dot with Holds)
  • Uses an ultra-efficient red LED illumination for daylight visibility and extended runtime
  • 50,000-hour battery life
  • Runs on readily available CR2032 batteries
  • MOTAC (motion-activated illumination) powers up or down when sensing motion
  • Unlimited eye relief to acquire aiming point and target, regardless of eye position behind sight
  • Strong, lightweight aircraft-grade 7075-T6 aluminum housing
  • Waterproof, IPX-8 rated, and fog-proof

View all the reticle options HERE.

Assembled in the USA.

View the User Manual HERE.


Overall Length67.5 mm
Overall Width50 mm
Height62.5 mm
Weight6.3 oz
Center Dot Size2 MOA
Adjustment Increments0.5 MOA
Illumination Settings9 Daytime / 3 NV
Run Time50,000 hours
Battery Type(1) CR2032
WaterproofingIPX 8

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This product cannot be shipped outside the US due to E.A.R. regulations.

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Our Most Recommended Rifle Upgrades – Help – T.REX ARMS

How Should You Set Up A Rifle? – Video –T.REX ARMS

LPVO Versus Red Dot + Magnifier – Video – YouTube

3 Tips to Shoot Rifle Better – Video – YouTube

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