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How to Pin AR Gas Block: A Comprehensive Guide
When it comes to maintaining and upgrading your AR-15 rifle, one of the most crucial components to consider is the gas block. The gas block is responsible for regulating the flow of gas from the barrel to the action of the firearm, ensuring proper cycling and reliability. One common method of securing the gas block is by pinning it in place. In this guide, we will delve into the process of pinning an AR gas block, covering various aspects to ensure a successful installation.
Understanding the Importance of Gas Block Pinning
The gas block is a critical component that connects the barrel to the upper receiver of your AR-15 rifle. It serves as a conduit for the gas that propels the bolt carrier group during the firing cycle. Ensuring that the gas block is securely fastened is essential for the following reasons:
- Preventing gas leakage, which can lead to malfunctions and reduced accuracy
- Stabilizing the barrel and gas system, enhancing overall performance
- Facilitating easy removal and replacement for maintenance or upgrades
Now that we understand the importance of gas block pinning, let’s dive into the process itself.
Tools and Materials Needed
Before you begin pinning your AR gas block, gather the following tools and materials:
- AR gas block
- Gas block pin
- Pin punch
- Hex wrench
- AR-15 cleaning rod
- Locking compound or thread locker
Ensure that you have the appropriate size gas block pin for your specific rifle model. The size of the pin is typically indicated on the gas block itself or in the manufacturer’s specifications.
Step-by-Step Guide to Pinning an AR Gas Block
Follow these steps to pin your AR gas block:
- Remove the existing gas block, if present, by loosening the hex bolt securing it to the barrel. Use the hex wrench to remove the bolt and carefully slide the gas block off the barrel.
- Apply a small amount of locking compound or thread locker to the threads of the gas block and the barrel.
- Insert the gas block pin through the barrel and into the gas block. Ensure that the pin is fully seated in both the barrel and the gas block.
- Use the pin punch to gently tap the pin into place. The pin should be flush with the surface of the gas block, but not protruding.
- Secure the gas block to the barrel by threading the hex bolt back into place. Tighten the bolt using the hex wrench until it is snug, but do not overtighten.
- Check the gas block for proper alignment and function. The gas block should be securely fastened and should not move when the bolt is actuated.
Precautions and Tips
Here are some precautions and tips to keep in mind when pinning your AR gas block:
- Always wear safety glasses and gloves when handling tools and firearms.
- Ensure that the gas block pin is the correct size for your rifle model to avoid damage or malfunctions.
- Do not overtighten the hex bolt, as this can cause damage to the threads or the gas block itself.
- Regularly inspect the gas block and pin for signs of wear or damage, and replace them if necessary.
By following these steps and precautions, you can successfully pin your AR gas block and ensure optimal performance and reliability for your rifle.
Table: Common AR Gas Block Pin Sizes
| Rifle Model | Gas Block Pin Size |
|---|---|
| Colt M4 | 0.154 inch |
| Rock Island Armory M4 | 0.154 inch |
| Smith & Wesson M&P15 | 0.154 inch |
| Stoner LAR |