Trijicon's red dot range comes down to four sights. The RMR is the compact, hard-use original. The RMR HD is its bigger-window duty update. The SRO is a large-window sight built for target and competition shooting, and the RCR is a sealed, closed-emitter sight. All four mount on the RMR footprint and run on a CR2032. Away from red dots, Trijicon also makes the ACOG fixed-power combat scope, the MRO rifle red dot and the Credo riflescopes.
This guide explains what each line is for, where the real differences lie, and which Trijicon models we currently stock.
Key takeaways
- RMR stands for Ruggedized Miniature Reflex, and its footprint is the one most optics-ready slides and plates are cut for.
- The SRO (Specialized Reflex Optic) shares the RMR footprint, but its much larger lens is designed for target and competition shooting.
- The RCR (Ruggedized Closed Reflex) is Trijicon's sealed, enclosed-emitter sight, also on the RMR footprint.
- Trijicon's spec sheet quotes the RMR Type 2 Adjustable LED as waterproof to 20 metres (66 ft), with more than four years of continuous use at setting 4 of 8.
- We stock Trijicon's pistol and reflex sights and RMR mounts, but not the ACOG, MRO or Credo lines.
The Trijicon reflex sights
| Sight | Emitter | Dot options we stock | Battery access | Best suited to |
|---|---|---|---|---|
| RMR Type 2 | Open | 1.0, 3.25 and 6.5 MOA | From underneath | Hard use, rails and slides alike |
| RMR HD | Open | 55 MOA circle with a 1.0 or 3.25 MOA dot | Top-loading | Duty-style use with a larger window |
| SRO | Open | 1.0, 2.5 and 5.0 MOA | Top-loading | Target and competition |
| RCR | Enclosed | 3.25 MOA | Top-loading | Wet, muddy or dusty conditions |
RMR Type 2: the benchmark
The RMR (Ruggedized Miniature Reflex) is the sight whose footprint became the industry reference. The Type 2 is the current version. Trijicon's spec sheet lists a CR2032 battery and waterproofing to 20 metres. The Adjustable LED models have eight brightness settings, including two for night vision and one "super bright", and are quoted at more than four years of continuous use at setting 4. We stock the RMR Type 2 RM06 (3.25 MOA), the RM07 (6.5 MOA) and the RM09 (1.0 MOA), all Adjustable LED, plus the RM01 3.25 MOA. There is also a green RM06 for shooters who prefer green.
The battery sits under the sight, so on a slide or plate you have to remove the RMR to change it, and then check your zero. That is the main practical trade-off against the newer top-loading designs.
RMR HD: the bigger-window update
The RMR HD keeps the original RMR footprint, according to Trijicon's launch information, but moves the CR2032 to a top-loading compartment, so the cell changes without removing the sight. It also adds a larger window. We stock the RMR HD with a 55 MOA circle and 3.25 MOA dot and a version with a 1.0 MOA dot. The housing is larger than the Type 2's, so check the fit against your slide or plate and rear sight.
SRO: built for target work
Trijicon's launch release describes the SRO (Specialized Reflex Optic) as designed for pistols and optimised for target and competition shooting. It uses the same footprint as the RMR, a top-loading CR2032, and is quoted at three years on setting 4 of 8. The large round lens makes the dot easier to find, but the housing is taller than an RMR's. The SRO2 2.5 MOA is the middle option between the 1.0 MOA SRO1 and the 5.0 MOA SRO3.
RCR: the enclosed option
The RCR (Ruggedized Closed Reflex) seals the emitter behind a front window, so rain, mud and lint cannot block the dot. Trijicon introduced it as a sealed pistol red dot on the RMR footprint. Launch reporting describes a top-loading CR2032 and waterproofing to 65 feet (about 20 metres). We stock the RCR1 3.25 MOA. The case for an enclosed emitter is made in our enclosed vs open red dot guide.
UK note
Most handguns are prohibited in Great Britain under section 5(1)(aba) of the Firearms Act 1968, so RMR-type sights here are bought mainly for rails on rifles, shotguns and gallery rifles, by airsoft players, by holders of Section 5 authority and by shooters in Northern Ireland, where the Firearms (Northern Ireland) Order 2004 has no equivalent general handgun prohibition. Confirm your own position with your police firearms licensing department.
Mounting an RMR on a rifle or shotgun
An RMR on a rail is a common UK setup, either as the main sight on a shotgun or gallery rifle or as an offset sight next to a magnified optic. We stock Trijicon's RM33 Picatinny mount, the taller RM34 mount for RMR and SRO, and the RM35 for fitting an RMR on top of an ACOG with bosses. Our offset and piggyback red dot range shows the other options.
ACOG, MRO and Credo
These are Trijicon's rifle lines. We do not currently stock any of them, but they complete the picture.
- ACOG (Advanced Combat Optical Gunsight): a fixed-power prism combat scope, such as the 4x32 with a BDC reticle. Many models are lit by fibre optic and tritium and need no battery. Trijicon also makes battery-powered LED versions, such as the 4x32 LED and 3.5x35 LED, so check the model.
- MRO (Miniature Rifle Optic): Trijicon's compact tube-style rifle red dot, now sold as the MRO SD and MRO HD.
- Credo: Trijicon's riflescope family, including 1-6x24, 1-8x28 and 1-10x28 LPVOs and hunting magnifications such as 2.5-15x42.
If you want a fixed-power prism now, see the prism scopes we stock. For variable magnification, see our LPVO rifle scopes.
Which Trijicon should you buy?
- Hardest use, smallest package: RMR Type 2 RM06 or RM07.
- Duty-style use with a larger window and top-loading battery: RMR HD.
- Target and competition, fastest dot pickup: SRO.
- Wet, muddy or dusty conditions: RCR.
- Rail-mounted on a shotgun or gallery rifle: RMR Type 2 on an RM33 or RM34 mount.
To see how Trijicon compares with the other big names, read our Holosun vs SIG ROMEO vs Trijicon RMR comparison. For the battery each sight takes, see the red dot sight battery chart.
Frequently asked questions
RMR or SRO?
The RMR is smaller and lower, which suits hard use and rails. The SRO's large lens makes the dot easier to find and is designed for target and competition shooting, but the sight is taller.
Do the RMR HD and SRO fit an RMR cut?
Both use the RMR footprint. The RMR HD's larger body is worth checking against your slide or plate and rear sight before you order; our RMR vs RMSc footprint guide covers fit.
Do I have to re-zero after changing an RMR battery?
On the RMR Type 2 the battery is underneath, so you remove the sight to change it and should confirm your zero afterwards. The RMR HD, SRO and RCR load from the top, so the sight stays on the gun.
Does the ACOG need batteries?
Many ACOG models are lit by fibre optic and tritium and need no battery. Trijicon also sells LED ACOGs that do, so check the specific model.
Shop this guide
- Trijicon RMR & Pistol Red Dot Sights — the RMR, RMR HD, SRO and RCR
- Trijicon Optics — sights, mounts and mounting kits
- RMR Footprint Red Dot Sights — every sight that fits an RMR cut
