Mounting a red dot sight might seem straightforward, but there’s a process to ensure optimal performance, accuracy, and longevity. I’ve worked with red dot sights on a variety of firearms over the years, and I’ve found that proper mounting can make all the difference between consistent hits and frustration at the range. So, here’s a step-by-step guide based on my experience and insights.
1. Choose the Right Mount
Before you even begin mounting your red dot, ensure that you have the appropriate mount for your firearm. Depending on your platform—whether it’s a pistol, rifle, or shotgun—the mounting system will differ. Typically, there are two main types of mounts: Picatinny and Weaver rails, both of which are common on modern firearms.
For pistols, you’ll often need to ensure your slide is either cut for a red dot or compatible with a mounting plate. Rifles and shotguns usually have pre-installed Picatinny rails, which makes the process easier. Make sure the mount you choose is compatible with the red dot sight and firearm.
2. Prepare Your Workspace
Before mounting, prepare your workspace and tools. I always recommend having the following items at hand:
- Properly-sized Allen wrenches or a torque wrench (for tightening screws)
- Loctite or thread locker (optional but recommended for screws)
- Screwdriver (if needed for certain mounts)
- Microfiber cloth (to clean the mount and optic surfaces)
Start with a clean firearm and red dot sight. Dust, dirt, or oil can interfere with the secure attachment of the sight. I usually wipe down the mount area and the bottom of the red dot with a microfiber cloth to ensure everything is clean and ready to go.
3. Position the Red Dot
Once your rail and mount are clean, you’ll want to position the red dot on the rail. Here’s where it gets a little specific depending on your platform:
- Rifles and Shotguns: Position the red dot closer to the mid or rear portion of the rail. I usually place it just forward of where the receiver meets the barrel, as this tends to provide a better balance of weight distribution and sight picture. Ensure it’s not too far forward, or you’ll risk eye strain when trying to acquire the dot.
- Pistols: Most pistols with red dot compatibility use an optic cut or a mounting plate. When mounting a red dot on a handgun, ensure the sight is snugly seated on the plate and that all screws align properly before tightening.
Make sure the red dot is oriented correctly. The lens should face forward, with the battery compartment or controls towards the rear.
4. Tighten Screws Properly
Tightening the screws is where attention to detail is key. Over-tightening or under-tightening can both lead to issues. This is where I recommend using a torque wrench if you have one. Most red dot sights have specified torque settings, typically around 15-20 inch-pounds for securing screws.
If you’re using a standard wrench or screwdriver, tighten the screws firmly but not excessively. You don’t want to strip the threads, but the sight needs to be secure to handle recoil. I usually add a small amount of blue Loctite to the screws for extra security, especially if I plan on using the firearm in high-recoil conditions or over extended periods.
5. Check Alignment and Co-Witness
Once the red dot is mounted, it’s important to check the alignment. On rifles or shotguns with iron sights, I always check for co-witnessing, which means the iron sights align with the red dot. You can have absolute co-witness, where the iron sights and dot perfectly overlap, or lower 1/3 co-witness, where the irons are slightly below the red dot.
For pistols, many red dots will allow for a co-witness with suppressor height sights, ensuring you can still use your iron sights as a backup.
6. Zeroing the Red Dot
After the red dot is securely mounted, the next crucial step is to zero the sight. I usually start with a bore sighting tool or manually align the red dot with my iron sights as a rough zero. Once I get to the range, I fine-tune the adjustments.
Most red dot sights have elevation (up/down) and windage (left/right) adjustments. I always take a few shots at a shorter distance—usually 10 to 15 yards—to confirm the red dot is close to zero, then work my way out to 25 yards (or further, depending on the firearm). It’s essential to make small adjustments and keep track of how many clicks you’re adjusting for precision.
7. Test and Recheck
Once the red dot is mounted, zeroed, and tested, I recommend shooting a few more rounds through the firearm over multiple range sessions to ensure the mount is holding firm. A proper mount should withstand the recoil of your firearm without loosening over time. I’ve found that a well-mounted red dot can stay zeroed for hundreds, even thousands, of rounds with no issues.
However, if you notice the dot shifting or screws loosening, you may need to reapply Loctite or even consider replacing your mount hardware with higher-quality components.
Common Mistakes to Avoid
- Skipping thread locker: Over time, recoil can loosen screws. A little blue Loctite goes a long way.
- Improper torque: Hand-tightening might feel enough, but it’s easy to under or overdo it. Use a torque wrench if possible.
- Misaligned red dot: Always double-check that the red dot is aligned and level before tightening it down.
Final Thoughts
Mounting a red dot sight properly is crucial for consistent accuracy and performance. It’s not a task you want to rush. Every firearm and sight combination is unique, so take your time to ensure everything is secure, aligned, and zeroed correctly. Once the red dot is properly mounted and zeroed, you’ll notice a significant improvement in your shooting experience. Whether for self-defense, competition, or recreational shooting, a properly mounted red dot makes target acquisition faster and shooting more enjoyable.
Remember, patience and attention to detail during the mounting process will save you time and frustration at the range.