Burris FastFire 2 vs 3 vs 4 vs C vs E: Which Red Dot Fits Your Gun?
All five Burris FastFire red dots compared — dot sizes, footprints, batteries, and which model fits pistols, micro-compacts, ARs, and shotguns.
On this page
The Burris FastFire family is five different sights for different jobs: the FastFire 3 (3 or 8 MOA, Docter footprint) is the do-anything classic; the FastFire 4 adds a larger window, four selectable reticles, and battery access behind the lens; the budget FastFire 2 (4 MOA) must be dismounted to change its battery; the FastFire C (6 MOA) is a sub-one-ounce micro dot on the Shield RMSc footprint for slim carry pistols; and the FastFire E ($420 MSRP) is the fully enclosed-emitter duty option on the Aimpoint ACRO footprint. Critically, the family spans three mounting footprints — check your cut or plate before picking a model.
Your buying path
The FastFire name covers different mounting jobs
Choose the FastFire 3 for the broad Docter-pattern ecosystem or the FastFire C for a true micro-compact RMSc route.
Burris FastFire 3 3 MOA with Picatinny mount
Best for: Rails, Docter-pattern pistol plates, AR risers, and the broadest accessory ecosystem
Why it leads: The with-mount FastFire 3 can move across more hosts than the micro-compact models.
The tradeoff: It is larger and uses a different footprint from RMSc carry optics.
Verify before ordering: Confirm the listing includes the Picatinny mount.
Burris FastFire C 6 MOA
Best for: A slim carry pistol with a documented RMSc cut
Why it leads: Its under-one-ounce body and always-on 6 MOA format are designed for the micro-compact job.
The tradeoff: It gives up the FastFire 3's larger accessory ecosystem.
Verify before ordering: RMSc and Docter/FastFire footprints are not interchangeable.
Retailer links are currently untagged and do not earn Optics Intel a commission. Availability never changes the recommendation.
“FastFire” started as one sight and quietly became a five-model family that spans three completely different mounting footprints and three duty roles. Retail listings rarely explain any of that, so here’s the whole lineup in one table and a straight answer on which one belongs on your gun.
The Family at a Glance
| FastFire 2 | FastFire 3 | FastFire 4 | FastFire C | FastFire E | |
|---|---|---|---|---|---|
| Dot | 4 MOA | 3 or 8 MOA | 4 selectable reticles (3 / 11 MOA elements) | 6 MOA | 3.5 MOA, red or green |
| Emitter | Open | Open | Open | Open, hooded | Fully enclosed |
| Footprint | Docter/Noblex | Docter/Noblex | Docter/Noblex | Shield RMSc | Aimpoint ACRO |
| Battery access | Remove sight | Top-load | Behind lens | Side/top, always-on | Side, always-on |
| Claimed battery life | ~5,000 hr | ~5,000 hr | ~26,000 hr | 25,000 hr | 60,000 hr |
| Weight | ~1 oz class | ~1 oz class | ~1 oz class | Under 1 oz | 2.45 oz |
| Best role | Budget plinker | All-rounder | Bigger window all-rounder | Micro-compact carry | Duty / hard use |
Specs per Burris’s published data; battery life varies with brightness setting.
Start With the Footprint, Not the Sight
The single most important fact about this family: it spans three mounting standards.
- FastFire 2, 3, 4 — Docter/Noblex pattern. Full compatibility guide here.
- FastFire C — Shield RMSc, the slim footprint used by most optics-ready micro-compact carry pistols.
- FastFire E — Aimpoint ACRO, the enclosed-emitter clamp standard.
If your slide is already cut — or you own plates — the footprint decision has been made for you, and only some of these models are in the running. Adapter plates exist but add height; direct fit is always better.
FastFire 2: The Legacy Budget Option
The 2 established the family: a simple 4 MOA open dot on the Docter pattern. Its dealbreaker by modern standards is battery access — the battery sits under the sight, so a battery change means unbolting the optic and confirming zero afterward. Worth buying only at clearance pricing.
FastFire 3: The Default
The 3 fixed the battery problem (top-loading), added selectable brightness levels plus an auto mode and a low-battery indicator, and comes in 3 MOA (rifles, crossover use) or 8 MOA (fast pistol work) versions. It’s Burris’s best-selling red dot and the hub of a whole mounting ecosystem: Picatinny risers, the AR-F3 co-witness mount — the same combination once sold with a laser as the AR-FFL — and the Speed Bead shotgun system.
FastFire 4: More Window, More Reticles
The 4 keeps the Docter footprint but grows the sight window for faster dot acquisition, switches to four selectable reticle patterns built around 3 MOA and 11 MOA elements (small dot for distance, big dot or combo for speed), moves battery access behind the lens so the sight stays mounted, and stretches claimed battery life to roughly 26,000 hours.
FastFire C: The Carry Micro
The C is a different animal: a sub-one-ounce micro dot sized for slim optics-ready carry pistols, on the RMSc footprint those slides actually wear. Fixed 6 MOA dot — the right call for defensive distances — 25,000-hour always-on battery, auto-brightness plus five manual settings, and a clever optional rear-post insert that pairs with your pistol’s front iron.
FastFire E: The Enclosed One
The E is Burris’s first enclosed-emitter FastFire: the diode lives inside a sealed monolithic 7075 aluminum housing, so snow, mud, and rain can’t blank the dot the way they can on any open emitter. A 3.5 MOA dot (red or green), 60,000-hour always-on battery with side access, eight brightness settings including two night-vision modes, and a 22x17mm window. At $420 MSRP it’s the premium pick, on the ACRO footprint that duty-style mounts increasingly standardize on.
Which One?
- Optics-ready full-size or compact pistol (Docter plate): FastFire 3 for value, 4 for the bigger window.
- Micro-compact carry gun (RMSc cut): FastFire C — it’s the only family member that fits.
- Duty use, hunting in weather, or anything hard: FastFire E.
- AR or shotgun: FastFire 3 or 4 on the AR-F3 or Speed Bead mounts.
- Tightest budget: a discounted FastFire 3 beats a FastFire 2 at similar money, every time — the battery-change difference alone.
We’ll be putting range time on the FastFire 3 first — our testing protocol — and this comparison will get measured results as reviews land.
Primary Sources
- Burris FastFire 2 product page and FastFire 3 product page — legacy/current status and core specifications.
- Burris FastFire 4 product page — reticle, window, battery, and accessory details.
- Burris FastFire C product page — RMSc footprint, weight, battery life, and controls.
- Burris FastFire E product page — ACRO footprint, enclosed housing, brightness settings, and current MSRP.
- Burris FastFire manuals — manufacturer operating and mounting instructions for every model in the comparison.
Decision recap
The short list
Burris FastFire 3 3 MOA with Picatinny mount
Rails, Docter-pattern pistol plates, AR risers, and the broadest accessory ecosystem
Burris FastFire C 6 MOA
A slim carry pistol with a documented RMSc cut
Retailer links are currently untagged and do not earn Optics Intel a commission. Availability never changes the recommendation.
Frequently Asked Questions
Do all Burris FastFire sights use the same footprint?
No — and this is the biggest buying trap in the lineup. The open-emitter FastFire 2, 3, and 4 share the Docter/Noblex footprint. The FastFire C uses the Shield RMSc footprint for slim micro-compact slides, and the enclosed FastFire E uses the Aimpoint ACRO footprint. Your slide cut or plate decides which models are even candidates.
What's the difference between the FastFire 3 and FastFire 4?
The 4 has a larger sight window for faster dot pickup, four selectable reticle patterns built around 3 MOA and 11 MOA elements instead of a single fixed dot, battery access behind the lens (no dismounting), and much longer claimed battery life — around 26,000 hours versus roughly 5,000 for the 3. The 3 counters with a lower price and the widest mount ecosystem in the family.
Is the FastFire 2 still worth buying?
Only at a steep discount. Its 4 MOA dot and Docter footprint are fine, but changing its battery means removing the sight and re-checking zero — the exact annoyance the FastFire 3's top-loading battery was created to fix.
Is the FastFire E night-vision compatible?
Yes — of its eight brightness settings, two are night-vision compatible. It's also the only enclosed-emitter FastFire, with a 3.5 MOA dot in red or green, a 60,000-hour always-on battery, and a monolithic 7075 aluminum housing.