Understanding the Anderson AR-15 Lower Receiver
The AR-15 platform has solidified its place as a cornerstone of the modern sporting rifle world. Celebrated for its modularity, adaptability, and widespread availability, the AR-15 has found a home in the hands of enthusiasts, competitive shooters, and even those seeking home defense solutions. A crucial component of this versatile platform is the lower receiver. It acts as the heart of the firearm, housing the trigger group, fire control components, and the magazine well. Among the many manufacturers offering AR-15 components, Anderson Manufacturing stands out for its commitment to affordability, making their AR-15 lower receivers a popular choice for budget-conscious builders and first-time AR-15 owners. However, while Anderson AR-15 lower receivers are generally known for their accessibility, it’s essential to recognize that certain potential issues can occasionally arise. This comprehensive guide delves into the common problems encountered with Anderson AR lower receivers, providing insight, solutions, and guidance to ensure a smooth and reliable build.
The lower receiver isn’t just a piece of metal; it’s the structural and functional core of the AR-15 rifle. It accepts the upper receiver, which houses the barrel, bolt carrier group, and handguard. The lower, therefore, is responsible for containing the trigger mechanism, the safety selector, the magazine release, and the buffer assembly, vital to the firearm’s operation. Its construction fundamentally impacts the overall function and longevity of the AR-15.
Anderson Manufacturing produces their lower receivers using various methods. The most common involves forging, a process that imparts strength and durability to the metal. Forged lowers are often favored for their resilience and resistance to wear. You may also encounter Anderson lowers manufactured using a billet process, involving machining from a solid block of aluminum. Both forging and billet methods typically utilize 7075-T6 aluminum alloy, a standard material for AR-15 receivers, known for its robust characteristics.
The advantages of opting for an Anderson AR-15 lower receiver are clear. Firstly, they offer an exceptionally attractive price point. This makes them an excellent entry point for anyone building an AR-15, allowing them to allocate funds towards other essential components like the upper receiver group, optics, or accessories. Secondly, Anderson lowers are widely available. They can be found at many gun stores, online retailers, and through various distributors. This availability simplifies the process of acquiring the essential foundation for your AR-15 build.
However, along with the many benefits, some potential drawbacks should be acknowledged. As with any product, the manufacturing process can occasionally lead to inconsistencies. Although Anderson strives for quality, their affordability necessitates some compromises. Certain issues may arise, demanding a keen eye, understanding of the AR-15 platform, and sometimes, some extra steps for a smooth build and reliable operation.
Common Anderson AR Lower Problems
Issues Related to Fit and Finish
Building an AR-15 often requires meticulous attention to detail, and one area where problems can surface is the fit and finish of the lower receiver. Imperfect tolerances can cause several frustrating issues.
The first frequent problem involves the fit between the lower and upper receivers. A poor mating can result in excessive play or, conversely, a tight fit that makes takedown and reassembly difficult. Manufacturing variations in the dimensions of the receiver, or the use of different manufacturing methods, can cause this. Sometimes, the issue can be exacerbated by the upper receiver. If play is observed, shims can be used to close the gap. Lapping the takedown pins can further improve the fit, ensuring a snug connection and improved accuracy.
Another potential area is the trigger pin holes. The trigger pin and hammer pin are essential components in the fire control group. If the holes are slightly out of spec or the finish within the holes is rough, it can create difficulties in trigger installation, lead to potential trigger malfunctions, or even cause the pins to walk out during firing. Solutions might involve verifying that the holes meet specification. In some cases, replacing the lower receiver might be necessary, if the issue is severe. Using anti-rotation pins can also help minimize the likelihood of trigger pin movement.
Issues with the magazine well are also commonly cited. The magazine well must accept and retain standard AR-15 magazines. A common complaint involves tight fits where magazines are challenging to insert and remove. Similarly, magazines may not seat properly or might drop free unexpectedly. These issues frequently stem from small dimensional variances in the magazine well. To address these problems, trying different magazine brands is often the first step. Some magazines are designed with slightly different dimensions and may fit better. Polishing or filing the magazine well to create more clearance can sometimes provide the necessary space. It is important, though, to remove only the necessary material and not compromise the structure of the lower. Modification of the magazine catch may also be needed in some cases to ensure positive magazine retention.
Problems with Component Installation
The precise assembly of the AR-15 is a crucial part of the process. Issues can arise during component installation, creating frustrating delays and requiring a thorough understanding of the rifle.
Installing the trigger and hammer can be a hurdle. Sometimes, it may be very difficult to insert the trigger and hammer pins, due to the design tolerances and finishing in the receiver. Burrs or slight deformities in the pin holes or trigger and hammer themselves can present an obstacle. Proper lubrication is crucial for smooth insertion. A trigger pin installation tool can be very helpful for precisely seating these pins, without causing any damage to the lower receiver. Always verify that all the pins and springs are in their proper position before installation and always use the right tool.
The bolt catch mechanism is another area where problems may be encountered. Installation can sometimes be challenging, potentially because of minor dimensional deviations or slight inconsistencies in the manufacturing. A careful alignment of the components and the right tools are essential to avoid damaging the lower receiver or the bolt catch itself.
Reliability Concerns
Beyond fit and installation, reliability is the ultimate measure of any firearm. A malfunctioning AR-15 is a source of frustration and a potential safety hazard.
Failure to feed or failure to extract are critical failures. Though the upper receiver often carries the majority of the responsibility for these functions, issues with the lower receiver can contribute. Problems with the magazine, buffer, and spring can lead to feeding issues. The magazine itself is crucial. Issues can be caused by using a damaged or inappropriate magazine. Inspect the magazine for any obstructions and ensure you are using an appropriate one for your ammunition and lower receiver. The buffer and spring also play a vital role. An improperly weighted buffer or a weak or damaged spring can cause feeding issues. The upper receiver, with its bolt carrier group, is, of course, central to feeding and extraction. Inspecting and cleaning the bolt carrier group, checking the gas key and gas tube alignment, are also very important when troubleshooting such issues.
Trigger function and double-feeding are also potential reliability concerns. Although trigger issues can sometimes be traced to the trigger mechanism itself, issues in the lower receiver can affect their function. Debris or burrs inside the lower receiver can interfere with the trigger’s movement. Always check the trigger and its connection within the lower receiver, including the hammer, sear, and disconnector.
Troubleshooting Anderson AR Lower Problems
If you encounter a problem with your Anderson AR lower receiver, a systematic approach to troubleshooting is crucial.
A logical start is a thorough visual inspection. Look for any obvious damage, burrs, or imperfections. Check all of the holes for proper alignment.
Using the correct tools, you should make sure that all the parts of your AR-15 are aligned in the right place. You will be able to identify any part that is preventing the system to work correctly.
Always start with the easiest and most likely problems first. Try to isolate the issue. For instance, if you are experiencing feeding issues, switch magazines to rule out a magazine issue. If the issue persists, then you must look for a more serious cause.
Remember that online resources such as forums can be extremely helpful for the solutions.
Prevention and Mitigation
Prevention is always better than cure. Several steps can be taken to minimize the likelihood of encountering problems with an Anderson AR lower receiver.
When purchasing an Anderson AR-15 lower receiver, always buy from a reputable dealer. Consider the retailer’s return and warranty policy. Check online reviews and forums to gauge the experiences of other customers. Before completing the purchase, perform a quick visual inspection, looking for any obvious flaws.
Once your lower is in your possession, proper maintenance is essential. This includes keeping the lower receiver clean. Inspect it regularly for any signs of wear. Apply a light coat of gun oil to protect the metal and ensure smooth operation.
Alternatives and Upgrades
While Anderson AR-15 lower receivers provide a cost-effective foundation, other options exist. If you are willing to invest more, you may find lower receivers from other manufacturers with tighter tolerances, superior finishes, and more advanced features.
Common upgrades can improve the function of an Anderson lower. A higher-quality trigger mechanism can improve accuracy and trigger pull. Anti-rotation pins can help eliminate trigger pin movement.
Conclusion
Anderson AR-15 lower receivers offer an accessible entry point for those building or upgrading an AR-15. While their price point makes them attractive, a thorough understanding of the potential problems associated with these lowers is essential for a positive building experience. By understanding the common problems, adopting proper troubleshooting techniques, and implementing preventive measures, you can enjoy a reliable and functional AR-15 rifle. Remember that proper knowledge of your rifle and its components is essential.
