Description
Bushnell's RXM-300 was designed with world champion shooter KC Eusebio who needed a durable pistol optic with a large window. This versatile reflex sight excels at pistol applications and uses the popular RMR/SRO footprint for direct mounting on select handguns, but also includes a weaver style adapter for use on rifles, carbines, and shotguns. The RXM-300 utilizes a massive 28mm wide by 24mm tall window, giving the optic a substantial field of view. This large format window is coated with Bushnell's exclusive EXO Barrier to shed water off the lens – this prevents the point source emitter's light beam from diffraction and keeps the reticle crisp. The reticle itself is a 4 MOA dot with 12 brightness settings and a runtime of up to 35,000 hours. The reticle features a shake awake function that instantly activates the optic when movement is detected, and deactivates after 5 minutes of motionlessness. Brightness can be manually adjusted, but an optional automatic ambient brightness adjustment can be used to adapt the optic automatically to changing light conditions. Additionally, the rugged aluminum housing ensures the glass and electronic internals are protected during field use and IPX7 rated sealing of the electronics allows the optic to be submerged at 1 meter for 30 minutes without damage.
Features of the Bushnell RXM-300 Reflex Sight:
- Designed with world champion shooter KC Eusebio
- Large 28mm wide by 24mm tall window
- EXO Barrier to shed water off the lens
- 12 brightness settings
- Up 35,000 hour runtime
- Shake awake motion activation
- Durable aluminum housing
Specifications
SKU
RXM300-BU
UPC
029757010384
MPN
RXM300
Magnification Range
1x
Objective Lens Diameter
28mm wide by 24mm Tall
Battery
Top loading CR2032
Reticle Details
4 MOA dot
Weight
1.95 ounces
Battery Type
CR2032
Item Condition
New
Product Type
Reflex Sight/Red Dot
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Optics Knowledge Center
Understanding Rifle Scope Basics
Magnification
Magnification refers to how much larger an object appears through the scope compared to the naked eye. Fixed power scopes have one magnification setting, while variable power scopes offer a range (e.g., 3-9x).
Objective Lens
The objective lens is the front lens that gathers light. Larger objective lenses (measured in mm) gather more light, providing brighter images in low-light conditions but add weight and require higher mounting.
Reticle
The reticle (crosshair) is the aiming point inside the scope. Modern scopes offer various reticle designs, from simple duplex crosshairs to complex ballistic reticles with holdover points for different distances.
Adjustments
Rifle scopes have turrets for windage (horizontal) and elevation (vertical) adjustments. These are measured in MOA (minutes of angle) or MRAD (milliradians) and allow precise aiming adjustments.
Proper Scope Mounting Guide
Select the Right Rings & Base
Choose rings that match your scope's tube diameter (typically 1", 30mm, or 34mm). Select a base compatible with your rifle's receiver. For heavy-recoiling rifles, opt for stronger mounts.
Install the Base
Clean the receiver and base thoroughly. Apply a small amount of blue Loctite to the screws. Attach the base to the receiver and torque the screws to manufacturer specifications.
Attach the Rings
Attach the bottom halves of the rings to the base. Place the scope in the rings and loosely attach the top halves. Don't fully tighten yet.
Set Eye Relief & Level
Position the scope for proper eye relief (3-4 inches) in your normal shooting position. Ensure the reticle is level using a scope leveling tool. Once positioned correctly, tighten the rings evenly in a cross-pattern.
Scope Zeroing Tips
Start Close
Begin zeroing at a shorter distance (25-50 yards) to ensure you're on paper before moving to your desired zero distance (typically 100 yards).
Use a Stable Rest
Always zero your rifle from a stable shooting position using a bench rest, sandbags, or a shooting rest to eliminate as much human error as possible.
Fire Groups
Fire 3-shot groups before making adjustments. This provides a more accurate representation of where your rifle is shooting than single shots.
Make Deliberate Adjustments
Know your scope's adjustment values (typically 1/4 MOA per click). If your group is 2 inches low at 100 yards, you'll need to adjust up 8 clicks (for a 1/4 MOA scope).
Confirm Your Zero
After making adjustments, fire another group to confirm your zero. Repeat the process until your point of impact matches your point of aim.
Document Your Settings
Once zeroed, record your settings including distance, ammunition used, and environmental conditions for future reference.
Optics Maintenance & Care
Cleaning Lenses
- Start by blowing or brushing away loose particles
- Use a lens pen or microfiber cloth for fingerprints
- For stubborn dirt, use lens cleaning solution (never household cleaners)
- Clean with gentle circular motions from center outward
Protecting Your Optics
- Always use lens caps when not in use
- Store in a dry place with silica gel packets
- Avoid extreme temperature changes
- Use a quality scope cover in harsh conditions
Regular Maintenance
- Check and tighten mount screws periodically
- Inspect O-rings and seals for damage
- Verify zero after rough handling
- Clean the exterior with a damp cloth
What to Avoid
- Never use fingers to touch lenses
- Avoid paper products (tissues, paper towels) on lenses
- Don't use acetone, alcohol, or household cleaners
- Never disassemble your scope (voids warranty)