The Burris Fastfire 3 and the Trijicon RMR are two of the best red dot sights available on the market.
Unsure which of the two is right for you?
Fear not, as we launch into a side-by-side comparison of these extraordinary optics hailing from two of the giants in the firearm accessories industry.
- Overview of the Burris Fastfire 3
- Overview of the Trijicon RMR
- Burris Fastfire 3 vs Trijicon RMR: The Similarities
- Burris Fastfire 3 vs Trijicon RMR: The Differences
- Frequently Asked Questions
- Final Verdict: Which Red Dot Sight Is Better?
Overview of the Burris Fastfire 3
- Type: Open/active
- Mount: None
- Dimensions: 1 x 1.9 x 1
- Weight: 0.9 oz
- Objective lens diameter: 21×15 mm
- Reticle: 3 MOA red dot
Burris is an optic brand known for its accuracy, durability, and innovation.
With nearly 50 years of experience in optical engineering, it’s no surprise why they are considered one of the gun market leaders.
The Burris Fastfire 3, which is considered to be an upgrade of their Burris Fastfire 2, is one of their most lauded products.
- Small and compact design (perfect for use on a Glock!)
- Extremely lightweight
- Large viewing window
- Incredible accuracy
- Easy to mount and adjust
- Speedy target acquisition
- 4 brightness settings with automatic mode
- Auto turn-off function
As one of the most lightweight red dot sights on the market, this is a great choice even for beginners.
This affordable and reliable red dot has a small and compact design, perfect for a pistol. However, you can also use it with rifles.
It can be paired with an existing sight or used as a primary sight.
Once you’ve found the right insert, all you need to do is remove the factory rear sight to mount it on.
Any windage and elevation adjustments necessary can be done quickly with the supplied tool.
However, if you lose the tool, you can easily use a coin or even a shell casing instead.
A single, simple button is all it takes to maneuver between the 4 brightness settings on this red dot sight.
Regardless of what brightness settings you choose, you can be assured of a crisp and clear red dot to give you a precision advantage.
The Fastfire 3 even has an auto turnoff function that shuts down the sight after 9 hours of inactivity. You need not worry about needlessly cutting down battery life due to forgetfulness.
All in all, this is a great red dot sight for a pistol. In the case of any mishaps, it comes with the Burris forever warranty.
If you’re interested to know even more, we also recommend this sight in our Best Shotgun Red Dots buying guide.
- Extremely lightweight
- Easy to use and adjust
- Fragile on and off switch
Overview of the Trijicon RMR
- Mount: Picatinny mount
- Dimensions: 1 x 1.8 x 1
- Weight: 1.2 oz
- Objective lens diameter: 22×16 mm
- Reticle: 3.5 or 6.5 MOA red dot
Trijicon is an American optic company known for its superior light aiming systems.
Since its founding in 1981, Trijicon has made top-of-the-line optics that have been trusted by state and law enforcement agencies for decades.
In fact, Trijicon is one of the official suppliers of scopes for the US Marine Corps.
While they are known for catering to rifles, they also make a great red dot sight for pistols in their RMR sight.
Let’s see what makes it great:
- Low profile
- Clear glass lens
- Incredibly lightweight
- Amazing accuracy
- Easy to view red dot
- Great for night vision purposes
The 6.5 MOA dot on this RMR-type sight is perfect for close-quarter combat.
However, this may be too much for long-range shooting.
It is recommended to switch to the 3.5 MOA dot for longer ranges, which is also available for this model.
This is ideal for night vision use, as well as for hunting applications.
Turning the sight on will automatically put it into the auto adjustment function.
This auto-brightness function means you don’t need to be adjusting brightness manually, making it a great choice for older shooters and those with eye problems.
However, if you prefer to make brightness adjustments manually, a single button can switch between automatic and manual brightness.
When on auto-brightness, the Trijicon RMR can go for more than 18 months even when left on 24/7 on a single battery.
The sight is made of forged aluminum material with a tough anodized coating. It can withstand even 300 rounds through a Gen4 Glock19 MOS without issues.
The multi-colored lenses on this sight allow for wide-band light transmission to minimize the change in the target area.
This reflex sight may require an adapter plate to be mounted on certain gun models, such as the Glock 10mm. It can also be mounted using a Picatinny mount.
TAKE NOTE: There have also been reports of the sight having a mind of its own and turning on and off whenever it pleases.
But don’t worry — this is when the excellent customer service of Trijicon comes into play. They’re willing to help you whenever, wherever!
We also recommend this product in our Top Shotgun Optics Guide if you want to know more.
- Maximum vision
- Hard to replace the battery
- May turn on and off randomly
Burris Fastfire 3 vs Trijicon RMR: The Similarities
There are several aspects where the Burris Fastfire and the Trijicon RMR share the same features.
Here’s a quick overview:
- Type: Open/active
- Reticle color: Red
- Magnification: 1x
- Eye relief: Unlimited
- Parallax Setting: Parallax free
- Adjustment Graduation: 1 MOA
Burris Fastfire 3 vs Trijicon RMR: The Differences
Before we go in-depth at where the Burris Fastfire 3 and the Trijicon RMR differ, let us take a glance at some of the major differences between them
Burris Fastfire 3:
- Origin: Philippines
- Max elevation adjustment: 115 MOA
- Max windage adjustment: 86 MOA
- Origin: USA
- Max elevation adjustment: 150 MOA
- Max windage adjustment: 150 MOA
With the technical differences out of the way, let us compare the Trijicon RMR and Burris Fastfire 3 in more depth.
One thing you will notice immediately is the price.
The Burris Fastfire 3 is known to be one of the most affordable red dots on the market.
The Trijicon RMR, on the other hand, is known to be a rather expensive option. It may not be the best reflex sight for someone on a budget.
We also have a guide on the best red dots as cheap as $100 if you’re interested in more budget options.
The Trijicon RMR has a unique patented housing shape that increases durability by absorbing impact and diverting stresses away from the lens.
This unique design, combined with its tough aluminum construction and anodized coating, makes this Trijicon reflex sight extremely difficult to break.
The Burris Fastfire 3, on the other hand, is probably one of, if not THE toughest miniature sight on the market.
While the Burris sight can definitely rival other red dot sights on the market in terms of durability, it is still no match for the strength of the Trijicon RMR.
The CR1632 battery on the Burris has a battery life of up to five years. This is made possible thanks to the automatic time-out feature on the sight, which shuts it off after 8 hours of idle time.
On top of that, it comes with a low battery warning indicator to warn you when you’re low on battery power.
Battery change is easy since the battery is located on top of the sight.
This makes them easily accessible and eliminates the need to remove the entire sight from the mount when it’s time to change.
The Trijicon, on the other hand, makes use of a CR2032 Lithium Battery which can be used for 2 years. However, it has a battery life of up to 5 years in dark storage.
While the Trijicon doesn’t have the auto-shutoff function of the Burris, it features a power conservation mode to automatically lower the brightness of the illuminated aiming dot after 16.5 hours.
When on brightness level 3, it can run continuously for years without needing a battery change.
However, you may run into a problem when the time comes to change the battery. As the battery is located underneath, you may need to disassemble the sight first to change the battery.
The Burris Fastfire 3 boasts a large window with a light blue tone and clear optics despite its small-scale design. This makes it easier to tighten shot groups during target acquisition.
The Trijicon, on the other hand, has two choices of MOA dot: 3.5 MOA or 6.5 MOA.
Regardless of which MOA dot you choose, one thing you can be assured of is that the red dot sight will be easily discernable under any light conditions.
The high-quality glass lens aids it with upgraded electronics, which allow for a clear sight picture to assist in fast acquisition.
Eye Box & Eye Relief
Both of these sights have unlimited eye relief.
However, it can be difficult to aim the RMR with both eyes open.
You may also need your eye to get a better view through the glass.
This can make it difficult to match your shots up with your dominant hand, thus making target acquisition more difficult.
Frequently Asked Questions
What Does RMR Stand for in Trijicon?
RMR stands for “Ruggedized Miniature Reflex Sight.” It is basically a modified Advanced Combat Optical Gunsight (ACOG).
Will Burris Fastfire 3 Fit the RMR Cut?
The Burris Fastfire 3 does not have the same mounting pattern as an RMR type sight and thus will not fit an RMR cut.
What Red Dots Have the Same Footprint as the Trijicon RMR?
The RMR type footprint features two holes for screws and two sockets for the pins on the mount/adapter. The sockets are situated in each corner on the front of the footprint.
Some red dots that share this same footprint include:
- Trijicon SRO
- Holosun HS407C
- Holosun HS508T
- ADE Advanced Optics RD3-020 Raptor
TAKE NOTE: A Trijicon footprint usually features sockets that are bigger in diameter and located farther apart.
Final Verdict: Which Red Dot Sight Is Better?
With better battery features, durability, and a less painful price tag, we believe that the Burris Fastfire 3 is the better red dot sight to be your primary optic.
This optic will deliver the best possible quality for your gun without breaking the bank.
HOWEVER, if you want something that can fit into an RMR footprint, you’d be better off with the Trijicon RMR.
FINAL TIP: If you’re still undecided, you can look for even more options in our buying guide for the best AR15 red dot sights.
CHANGELOG: May 16, 2022 - minor content edits