Troubleshooting 350 Legend AR Feeding Issues: A Comprehensive Guide

The 350 Legend cartridge has gained significant popularity in the AR-15 platform for its straight-walled design, making it legal for hunting in many states where traditional bottleneck cartridges are restricted. However, like any firearm system, the 350 Legend AR can experience feeding issues. This comprehensive guide will delve into the common causes of these problems and offer practical solutions to ensure reliable performance. Understanding the intricacies of the 350 Legend AR platform is crucial for resolving any malfunctions. This article provides a detailed look at common 350 Legend AR feeding issues and how to resolve them, ensuring your rifle functions flawlessly.

Understanding the 350 Legend AR System

Before diving into troubleshooting, it’s important to understand the key components of a 350 Legend AR-15. The AR-15, originally designed for the 5.56 NATO cartridge, requires specific modifications to reliably function with the larger diameter 350 Legend. These modifications primarily involve the magazine, bolt, and sometimes the upper receiver.

Magazine: 350 Legend magazines are designed with a modified follower and feed lips to properly present the cartridge to the chamber. Using standard AR-15 magazines will almost certainly result in feeding failures.
Bolt: The bolt face must be specifically machined to accommodate the larger case head of the 350 Legend. A standard 5.56 bolt will not work.
Upper Receiver (Optional): While not always necessary, some manufacturers recommend using a dedicated 350 Legend upper receiver to ensure optimal alignment and feeding.

Common Causes of 350 Legend AR Feeding Issues

Several factors can contribute to 350 Legend AR feeding issues. Identifying the root cause is the first step towards resolving the problem. Here’s a breakdown of the most common culprits:

Magazine Problems

The magazine is often the primary source of feeding problems in a 350 Legend AR. Issues can arise from several areas:

Incorrect Magazine: Using a magazine not specifically designed for the 350 Legend is the most common mistake. Always use magazines clearly marked for 350 Legend.
Damaged or Worn Feed Lips: The feed lips are responsible for holding the cartridge in place and releasing it at the correct angle for feeding. Bent, damaged, or worn feed lips can cause misfeeds.
Weak Magazine Spring: A weak magazine spring can fail to push the cartridges up with sufficient force, leading to failures to feed.
Dirty Magazine: Dirt, debris, and excessive lubrication can impede the movement of cartridges within the magazine.

Bolt and Carrier Group Issues

The bolt and carrier group play a critical role in stripping the cartridge from the magazine and chambering it. Problems in this area can also lead to 350 Legend AR feeding issues:

Incorrect Bolt: Using a standard 5.56 bolt will not work with the 350 Legend. The bolt face must be machined to the correct dimensions.
Dirty or Dry Bolt Carrier Group: A dirty or insufficiently lubricated bolt carrier group can slow down the cycling of the action, leading to failures to feed.
Extractor Problems: A worn or damaged extractor can fail to properly grip the cartridge rim, causing malfunctions.
Ejector Problems: A weak or broken ejector can prevent the spent casing from being ejected, leading to a double feed.

Chamber and Barrel Issues

The chamber and barrel also contribute to the feeding process. Issues in these areas, though less common, can still cause problems:

Rough Chamber: A rough or poorly finished chamber can impede the smooth chambering of the cartridge.
Incorrect Headspace: Improper headspace can prevent the bolt from fully locking, leading to failures to feed.
Barrel Extension Issues: The barrel extension houses the feed ramps, which guide the cartridge into the chamber. Damage or misalignment can cause feeding problems.

Ammunition Problems

While less frequent, the ammunition itself can sometimes be the cause of 350 Legend AR feeding issues:

Out-of-Spec Ammunition: Ammunition that is not manufactured to proper specifications can cause feeding problems.
Deformed Cartridges: Dents, dings, or other deformities can prevent the cartridge from chambering correctly.
Incorrect Bullet Profile: Certain bullet profiles may not feed as reliably as others in some rifles.

Gas System Issues

The gas system is responsible for cycling the action. While less directly related to feeding, problems here can indirectly cause malfunctions:

Under-Gassed: If the rifle is under-gassed, the bolt carrier group may not cycle fully, leading to failures to feed. This is more common with shorter barrel lengths or adjustable gas blocks set too low.
Over-Gassed: While less common, an over-gassed system can cause the bolt to cycle too quickly, potentially leading to feeding issues.

Troubleshooting Steps for 350 Legend AR Feeding Issues

Here’s a systematic approach to troubleshooting 350 Legend AR feeding issues:

Step One: Verify Magazine Compatibility

The first and most crucial step is to ensure you are using a magazine specifically designed and marked for the 350 Legend cartridge. Using a standard AR-15 magazine is almost guaranteed to cause problems.

Step Two: Inspect and Clean Magazines

Thoroughly inspect your 350 Legend magazines for any signs of damage, such as bent or cracked feed lips. Disassemble the magazine and clean all components, removing any dirt, debris, or excessive lubrication. Reassemble the magazine carefully.

Step Three: Test with Different Magazines

If you have multiple 350 Legend magazines, try using different ones to see if the problem is isolated to a specific magazine. This can help you quickly identify a faulty magazine.

Step Four: Inspect the Bolt and Carrier Group

Remove the bolt and carrier group from the rifle. Inspect the bolt face to ensure it is the correct type for the 350 Legend. Clean the bolt and carrier group thoroughly, paying attention to the extractor and ejector. Lubricate the bolt carrier group according to the manufacturer’s recommendations. [See also: AR-15 Bolt Carrier Group Maintenance]

Step Five: Check the Chamber and Feed Ramps

Visually inspect the chamber for any signs of roughness or damage. Use a chamber brush and solvent to clean the chamber thoroughly. Examine the feed ramps on the barrel extension for any burrs or misalignment. If necessary, a gunsmith can polish the feed ramps to improve feeding.

Step Six: Try Different Ammunition

If you suspect the ammunition may be the problem, try using a different brand or type of 350 Legend ammunition. Ensure the ammunition is clean and free from any deformities.

Step Seven: Check Gas System (If Applicable)

If your rifle has an adjustable gas block, experiment with different settings to see if it improves feeding. If the rifle is consistently under-gassed, you may need to adjust the gas block or use a lighter buffer. Consult a gunsmith if you are unsure how to adjust the gas system properly.

Step Eight: Seek Professional Assistance

If you have exhausted all of the above troubleshooting steps and are still experiencing 350 Legend AR feeding issues, it is best to seek the assistance of a qualified gunsmith. They can diagnose and repair any underlying problems with the rifle.

Preventative Maintenance to Avoid Future Issues

Regular maintenance is crucial for preventing future 350 Legend AR feeding issues. Here are some tips:

Clean and Lubricate Regularly: Clean and lubricate your rifle after each shooting session to prevent the buildup of dirt and carbon.
Inspect Magazines Regularly: Inspect your magazines for any signs of damage and replace them as needed.
Use Quality Ammunition: Use high-quality, factory-loaded 350 Legend ammunition.
Follow Manufacturer’s Recommendations: Adhere to the manufacturer’s recommendations for maintenance and lubrication.

Conclusion

350 Legend AR feeding issues can be frustrating, but by understanding the potential causes and following a systematic troubleshooting approach, you can often resolve these problems yourself. Remember to always prioritize safety and consult a qualified gunsmith if you are unsure about any aspect of firearm maintenance or repair. With proper maintenance and attention to detail, your 350 Legend AR can provide reliable performance for years to come. By addressing the most common 350 Legend AR feeding issues, you can maintain a functional and reliable firearm. The key is understanding the specific needs of the 350 Legend cartridge in the AR-15 platform. Proper magazines and a clean, well-maintained rifle are essential for preventing malfunctions. Remember that addressing 350 Legend AR feeding issues promptly will ensure a safe and enjoyable shooting experience. Consistent attention to detail will minimize the occurrence of 350 Legend AR feeding issues and keep your rifle functioning optimally. Always prioritize safety and consult a qualified gunsmith if you encounter persistent 350 Legend AR feeding issues. With proper care, your 350 Legend AR can provide years of reliable service, free from 350 Legend AR feeding issues. Addressing 350 Legend AR feeding issues requires a thorough understanding of the rifle’s components. Regular maintenance and careful troubleshooting can help prevent and resolve 350 Legend AR feeding issues, ensuring reliable performance. By following these guidelines, you can minimize the risk of encountering 350 Legend AR feeding issues and enjoy a safe and enjoyable shooting experience. Understanding the nuances of the 350 Legend cartridge and its interaction with the AR-15 platform is crucial for preventing and resolving 350 Legend AR feeding issues.