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What Size Trigger Pin AR-15: A Comprehensive Guide
When it comes to the AR-15, one of the most frequently asked questions is about the size of the trigger pin. This small but crucial component plays a significant role in the functionality and reliability of your firearm. In this article, we will delve into the details of the trigger pin size for the AR-15, providing you with a comprehensive guide to ensure you make the right choice for your firearm.
Understanding the Trigger Pin
The trigger pin is a small, cylindrical pin that holds the trigger assembly in place within the receiver of an AR-15 rifle. It is typically made of steel and is designed to withstand the stress and pressure exerted on the trigger assembly during use. The trigger pin is an essential part of the firearm’s trigger group, which includes the trigger, hammer, and sear.
There are two main types of trigger pins used in AR-15s: the standard trigger pin and the extended trigger pin. The standard trigger pin is typically 0.154 inches in diameter and is used in most AR-15s. The extended trigger pin, on the other hand, is 0.187 inches in diameter and is used in some custom builds and certain models of the AR-15.
Standard Trigger Pin Size
As mentioned earlier, the standard trigger pin size for the AR-15 is 0.154 inches in diameter. This size is suitable for most factory-built AR-15s and is the most commonly used trigger pin size. The standard trigger pin is also known as the M6 trigger pin, as it is compatible with the M6 receiver holes in the firearm’s receiver.
When installing a standard trigger pin, it is important to ensure that it fits snugly into the receiver’s holes. A loose trigger pin can cause the trigger assembly to move excessively, leading to a gritty or inconsistent trigger pull. Conversely, a trigger pin that is too tight can cause damage to the receiver or trigger assembly.
Extended Trigger Pin Size
The extended trigger pin is 0.187 inches in diameter and is used in some custom builds and certain models of the AR-15. This larger pin size is designed to provide additional support and stability to the trigger assembly, which can be beneficial in certain situations.
When using an extended trigger pin, it is important to ensure that the receiver has the appropriate holes for this larger pin size. Some receivers may require modification or the use of specialized receiver inserts to accommodate the extended trigger pin.
Choosing the Right Trigger Pin
When selecting a trigger pin for your AR-15, it is important to consider the following factors:
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Firearm Model: Check the manufacturer’s specifications for your specific AR-15 model to determine the recommended trigger pin size.
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Custom Builds: If you are building a custom AR-15, you may need to use an extended trigger pin to accommodate certain modifications or to enhance the firearm’s performance.
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Receiver Holes: Ensure that the receiver holes are the correct size for the trigger pin you choose. If necessary, modify the holes or use receiver inserts to achieve a proper fit.
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Quality: Choose a trigger pin made from high-quality steel to ensure durability and reliability.
Installation and Maintenance
Proper installation and maintenance of the trigger pin are crucial for the performance and longevity of your AR-15. Here are some tips to help you with the installation and maintenance of the trigger pin:
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Use the Correct Tools: Use the appropriate tools, such as a trigger pin punch and hammer, to install and remove the trigger pin.
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Ensure a Tight Fit: Make sure the trigger pin fits snugly into the receiver holes, but avoid over-tightening, which can damage the receiver or trigger assembly.
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Regular Inspection: Periodically inspect the trigger pin and other components of the trigger group for signs of wear or damage.
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Professional Assistance: If you are unsure about the installation or maintenance of the trigger pin, seek the assistance of a qualified firearms technician.
In conclusion, the trigger pin is a vital component of the AR-15 that requires careful consideration when selecting and maintaining. By understanding the different trigger pin sizes and their applications, you can ensure that your firearm performs reliably and safely.