Will an EOTech Fit on a BCM Upper?
The short answer is yes, an EOTech sight will generally fit on a BCM (Bravo Company Manufacturing) upper receiver. Both EOTech and BCM utilize standard AR-15/M16 specifications for their mounting systems, making them compatible. However, there are a few nuances to consider for a complete understanding.
Understanding the Mounting System
EOTech holographic weapon sights primarily use a Picatinny rail for mounting. BCM upper receivers are designed with a full-length Picatinny rail system, meaning there are multiple mounting points along the top. This standard compatibility ensures a secure and reliable fit.
Factors to Consider for a Perfect Fit
While the general compatibility is high, there are a few factors to check to ensure a smooth and problem-free installation:
- Specific EOTech Model: While most EOTech models use a standard Picatinny mount, always double-check the specifications of your particular EOTech model. Some older or specialized models might have slightly different mounting requirements.
- Mounting Hardware: Always use the mounting hardware provided with your EOTech sight. Using incorrect screws or other hardware can damage your sight or the upper receiver. Never substitute with random parts found in your toolbox!
- Rail Condition: Ensure the Picatinny rail on your BCM upper receiver is clean, free of debris, and undamaged. A damaged rail could interfere with a secure mount and potentially lead to zeroing issues or even sight failure during use.
- Proper Torque: When tightening the mounting screws, use the correct torque. Over-tightening can damage the rail or sight, while under-tightening could result in a loose mount. Consult your EOTech and BCM manuals for recommended torque specifications.
Beyond the Basic Fit: Co-witnessing and Other Accessories
Once you've ensured a secure fit, you might want to consider co-witnessing your EOTech with iron sights. Many users prefer this setup as a backup sighting system. BCM uppers are designed to accommodate this. Consider this factor when choosing your mounting height for the EOTech. There are different height mounts available to achieve the desired co-witnessing setup.
Additionally, you may plan to add other accessories to your BCM upper such as a magnifier or other optics. It's crucial to verify that these accessories are also compatible with the EOTech and the BCM upper receiver’s rail system to avoid any potential fitting issues.
Conclusion
In summary, an EOTech should fit seamlessly onto a BCM upper receiver thanks to their adherence to standard AR-15 specifications. However, always double-check the specific models and use appropriate mounting hardware and techniques to ensure a safe and reliable setup. Following the manufacturer's instructions and taking the necessary precautions will guarantee a successful and long-lasting integration.
