The short answer is: yes, an EOTech optic will generally fit on a BCM (Bravo Company Manufacturing) upper receiver. However, there are nuances to consider to ensure a proper and secure fit. This guide will delve into the specifics, addressing common concerns and providing crucial information for anyone considering this setup.
Understanding the Compatibility Factors
The compatibility between an EOTech sight and a BCM upper hinges on several key factors:
1. Picatinny Rail Standard
Both EOTech sights and BCM uppers adhere to the standard Picatinny rail system. This ensures a generally compatible mounting solution. The Picatinny rail, a standardized MIL-STD-1913 rail, is designed for modularity and interchangeability of accessories. This means most optics designed for Picatinny rails will fit most uppers with Picatinny rails, including BCM uppers.
2. Rail Length and Optic Size
While the rail standard is consistent, the length of the rail on your BCM upper and the size of your EOTech optic are crucial. Ensure your BCM upper has enough rail space to accommodate the EOTech and any other accessories you plan to mount (like a magnifier or backup iron sights). Larger EOTech models might require more rail space.
3. Mounting Hardware
Using the correct mounting hardware is essential for a secure and reliable fit. EOTech typically comes with its own mounting hardware, but always double-check its compatibility with your BCM upper. Improper mounting can lead to zero shift or even damage to your optic or firearm.
4. Specific BCM Upper Models
While most BCM uppers will accept an EOTech, it's always wise to check the specifications of your particular BCM upper model. While unlikely, minor variations between models could theoretically impact compatibility. Referring to the manufacturer's specifications for both the BCM upper and the EOTech optic is the best way to guarantee compatibility.
Potential Issues and Troubleshooting
While generally straightforward, there are potential issues to be aware of:
- Obstructions: Certain accessories mounted on the rail might interfere with the EOTech's placement. Careful planning and positioning of accessories is crucial.
- Misaligned Rail: Although rare, a slightly misaligned rail on the BCM upper could create fitting issues. This is usually a manufacturing defect and should be addressed with the manufacturer.
- Improper Torque: Over-tightening or under-tightening the mounting screws can damage the optic or rail. Always follow the manufacturer's recommended torque specifications.
Best Practices for Mounting an EOTech on a BCM Upper
- Inspect the Rail: Before mounting, thoroughly inspect the Picatinny rail on your BCM upper for any damage or obstructions.
- Choose the Right Mount: Select a mount appropriate for your specific EOTech model. Use the provided mounting hardware and follow the manufacturer's instructions carefully.
- Secure Mounting: Ensure the EOTech is firmly and securely mounted to the rail, using the appropriate torque.
- Zeroing: After mounting, take your weapon to a range and properly zero your EOTech to ensure accuracy.
Conclusion: A Secure and Reliable Combination
In conclusion, an EOTech sight is generally compatible with a BCM upper receiver. By understanding the compatibility factors, addressing potential issues, and following best practices, you can ensure a secure, reliable, and accurate setup for your firearm. Always prioritize safety and consult the manufacturer's instructions for both your EOTech and BCM components.
