Are you a firearms enthusiast looking to take your AR-15 to the next level? If so, you’ve probably heard of the AR-15 Lightning Link – a device that can turn your semi-automatic Bushmaster, Sendra, Essential Arms into a full-auto machine gun.
What is the AR-15 Lightning Link?
The AR-15 Lightning Link is a unique device designed to enhance the performance of your AR-15. It’s important to note that the Lightning Link is not compatible with all AR-15s. It drops into Colt SP-1 rifles and a few early civilian-made AR-15s, including models from Bushmaster, Sendra, Essential Arms, and most PWA pre-ban lower receivers. However, after 1989, Colt added a “High Shelf” to their lower receivers to prevent the installation of the Lightning Link. If you have such a lower, it will need to be milled to fit.
Modern lowers may have a “Low Shelf,” but they might not be properly rounded in the rear to accommodate the Lightning Link. Again, milling may be required for proper fitting.
Additionally, the Lightning Link only works with Colt SP-1 bolt carriers. If your AR-15 has a commercial bolt carrier or an M-16 carrier, modifications will be needed for compatibility.
How Does the Lightning Link Work?
The Lightning Link operates by exploiting the mechanics of the AR-15’s trigger and hammer. When the trigger is held back, the sear is positioned below the arc of the hammer notch, holding the hammer in the cocked position. The only thing preventing the hammer from falling is the disconnector.
The Lightning Link achieves full-auto fire by pulling the disconnector to the rear, releasing the hammer. The link is assembled flat in the lower receiver, with the opening at the front fitting over the disconnector hook and the upright resting between the upper receiver take-down pin post and the bolt carrier.
In operation, the take-down pin post serves as a fulcrum point. When the bolt carrier strikes the tap of the link’s upright, the lower end moves backward, releasing the hammer from under the disconnector hook. As long as the trigger is held back, the bolt carrier’s movement will cock the hammer under the disconnector hook, creating a cyclic firing mechanism.
Compatibility and Installation
The Lightning Link is compatible with standard mil-spec AR-15 rifles chambered in .223/5.56 NATO. It is not compatible with AR-10 rifles or any other rifle platforms.
To install the Lightning Link in your AR-15:
- 1. Remove the Lower Receiver: Disassemble the lower receiver and remove the magazine release and trigger group.
- 2. Attach the Lightning Link: Attach the Lightning Link according to the provided instructions, ensuring it fits properly.
- 3. Secure the Lightning Link: Use threadlocker to secure the Lightning Link to the lower receiver.
- 4. Reassemble the Lower Receiver: Reassemble the lower receiver, ensuring all components are properly installed.
- 5. Test and Adjust: Test the Lightning Link to ensure proper operation and adjust the trigger engagement if necessary.
The AR-15 Lightning Link is a fascinating accessory that can transform your semi-automatic AR-15 into a full-auto powerhouse. However, it’s essential to understand its compatibility limitations and the need for proper installation and adjustments. Always follow safety guidelines and local laws when considering such modifications to your firearm.
Before making any purchase, ensure that you thoroughly research the legal regulations surrounding the use of such devices in your area. Your safety and compliance with the law should always be the top priority.
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