Burris FastFire® E — Enclosed Emitter Red Dot

Models & Item #s: Red Dot (300266) · Green Dot (300267) | Dot size: 3.5 MOA | Battery: 1× CR2032 (side-load) | Footprint: ACRO™ P-2

Tech Notes — Astigmatism, Blurry Dots & Setup Tips
• Astigmatism: Uncorrected astigmatism or dry eyes can make the dot look like a starburst/comet. Check via a phone camera (dot should look crisp) and/or lower brightness.
• Training (handguns): Bring the sight close to your eye to acquire the dot, then press out slowly while keeping it centered; repeat until presentation is automatic.
• Mounting gotcha: If you see a tiny emitter glow low in the field of view but no dot on the window, the sight is likely mounted backward—flip it.
• Emitter cleanliness: Smudges, oil, or dust on the small emitter lens can blur/flare the dot. Blow off dust, use a soft lens brush, then (only if needed) a tiny amount of lens cleaner on microfiber. Avoid harsh solvents; don’t touch the LED.

1) Itemized Components (Product Map)

Item #	Component	What it does
1	“+” Button	Increases brightness (8 daylight + 2 NV). Used with “−” for timer/lock functions.
2	“−” Button	Decreases brightness; long-press for hard shutdown.
3	Elevation Adjustment (top)	1 MOA per tick; 100 MOA total travel.
4	Windage Adjustment (side)	1 MOA per tick; 100 MOA total travel.
5	Sight Window	0.87″ × 0.67″ (22 × 17 mm); parallax-free, true 1×.
6	Battery Cap (side)	CR2032; tighten to 7.8 in-lb with the included tool or a coin.
7	ACRO Clamp Screw	Tighten to 23 in-lb on the ACRO P-2 rail; press optic forward while tightening.

2) Package Contents & Mounting Footprint

Included	Footprint / Hardware
FastFire E; Sight Adjustment/T10 torx wrench; 1× CR2032 battery; lens cloth; user guide.	ACRO™ P-2 footprint (aftermarket ACRO plates or ACRO slide cuts). Clamp torque: 23 in-lb · Battery-cap torque: 7.8 in-lb.

Where can I get ACRO mounts for my firearm?

3) Button Controls — Quick Reference

Action	Result
Press “+” (from OFF)	Turns ON at brightness level 9
Press “−” (from OFF)	Turns ON at brightness level 9
Hold “+” & “−” for 5 s	Toggle Button Lockout (two flashes on activation)
Hold “+” & “−” for 10 s	Toggle 13-hour timer (three flashes on disable)
Hold “−” for ~3 s	Hard shutdown
Tap “+” / “−”	Adjust brightness through 10 levels (8 daylight + 2 NV)

Timer default: after ~13 hours, Red model (300266) returns to level 7; Green model (300267) to level 6.

4) Power & Battery

Battery type: CR2032. Install with “+” facing out; snug the cap to 7.8 in-lb using the included tool or a coin.
Always-on readiness: Factory-configured for constant-on operation; typical life ~60,000 hrs at level 5.
NV support: 2 night-vision levels in addition to 8 daylight settings.

5) Zeroing

Adjusters: Use the included T10 tool; follow the arrows on each screw.
Graduation: 1 MOA per tick mark (~1″ @ 100 yd; ~¼″ @ 25 yd).
Travel: Elevation 100 MOA · Windage 100 MOA.

6) Mounting (ACRO P-2)

Open the clamp, place over the ACRO rail, press the optic forward to seat the recoil lug, then tighten the clamp screw to 23 in-lb.
For slides/plates using ACRO adapters, follow the plate manufacturer’s instructions.

7) Environmental & Care

Rated IPX7 waterproof. After salty/dirty water, rinse with distilled water and dry.
Clean optics with blower/soft brush first; then lens tissue/solution if needed.

8) Quick Specs (Reference)

Spec	Value
Magnification	1×
Brightness Levels	8 daylight + 2 NV
Window	0.87″ × 0.67″ (22 × 17 mm)
Reticle	3.5 MOA (Red or Green)
Adjustment Range	Elevation 100 MOA / Windage 100 MOA
Adjustment Graduation	1 MOA per tick mark
Operating / Storage Temp	−13 °F to +140 °F / −22 °F to +140 °F
Power Supply	1× CR2032 (side-load)
Dimensions (L × W × H)	1.81″ × 1.42″ × 1.26″ (46 × 36 × 32 mm)
Weight	2.45 oz (69.6 g)
Waterproof	IPX7
Battery Life	Up to ~60,000 hrs (level 5)

User Guide (PDF): FastFire E User Guide — INSTR-0260 (REV2)

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