The Anderson Manufacturing lower receiver, a popular choice among budget-conscious AR-15 builders, sometimes presents issues. This isn't inherently a reflection of poor quality, but rather a consequence of manufacturing tolerances and the complexities of the AR-15 platform. Understanding these potential problems and their solutions is crucial for ensuring a reliable and safe firearm.
Common Anderson Lower Receiver Problems
Several recurring issues plague Anderson lowers, ranging from minor annoyances to potential safety hazards. Let's delve into the most frequently reported problems:
1. Magazine Compatibility Issues
One common complaint is difficulty with magazine insertion or function. This can stem from:
- Misaligned Magazine Well: Slight imperfections in the manufacturing process can lead to a magazine well that's not perfectly aligned with the receiver's internal dimensions. This results in magazines binding or failing to fully seat.
- Burrs or Rough Edges: Burrs inside the magazine well can impede smooth magazine insertion. These irregularities can snag on the magazine, causing feeding problems.
Solutions:
- Careful Inspection: Thoroughly inspect the magazine well for burrs, misalignments, or imperfections. Use a deburring tool or fine file to carefully remove any burrs.
- Magazine Selection: Experiment with different magazines from reputable manufacturers. Some magazines have tighter tolerances than others. Finding a compatible magazine may resolve the issue.
- Professional Fitting (if necessary): In extreme cases, a gunsmith may need to carefully adjust the magazine well for proper alignment.
2. Bolt Catch Issues
The bolt catch, responsible for holding the bolt to the rear after the last round is fired, can sometimes malfunction with Anderson lowers. This can be attributed to:
- Improper Bolt Catch Engagement: The dimensions of the bolt catch recess might be slightly off, preventing proper engagement with the bolt catch.
- Loose or Broken Bolt Catch: A loose or damaged bolt catch can fail to engage correctly.
Solutions:
- Check for Proper Engagement: Visually inspect the bolt catch's interaction with the lower receiver. Ensure it's fully seating and engaging with the bolt.
- Replace the Bolt Catch: If the bolt catch is loose or damaged, replace it with a new one from a reputable manufacturer.
3. Trigger Pin Issues
The trigger pin can be difficult to install or remove, or may even be loose. This can be a result of:
- Tight Tolerances: In some cases, the holes for the trigger pin are slightly too tight.
- Burrs: As with the magazine well, burrs can interfere with smooth trigger pin insertion and removal.
Solutions:
- Lubrication: Apply a lubricant to the trigger pin before installation.
- Careful Installation: Use gentle but firm pressure when installing the trigger pin.
- Deburring: Remove any burrs interfering with the trigger pin.
- Professional Assistance: If you're encountering significant difficulty, seek professional help from a gunsmith.
4. Overall Fit and Finish
Some Anderson lowers exhibit inconsistencies in fit and finish compared to higher-end manufacturers. This isn't necessarily a functional problem, but it can affect aesthetics and overall build quality.
Solutions:
- Careful Assembly: Pay close attention to proper assembly procedures and tolerances during the build process.
- Acceptance of Imperfections: Understand that budget-friendly options may have some cosmetic imperfections.
Addressing the Concerns
It's important to approach any problems with your Anderson lower receiver systematically. Start with a thorough inspection, addressing minor issues yourself with careful attention to detail. If problems persist or safety is compromised, consult a qualified gunsmith. Remember that proper assembly, careful handling, and regular maintenance are key to ensuring the reliable performance of any firearm, including those built on Anderson lower receivers.
