Omar Khalid
AR-15 is a type of rifle that can be built from an unfinished, unserialized receiver called an 80% lower because it isn't considered a firearm under federal law. These 80% lowers are available in different materials, including billet and forged aluminum, as well as polymer. While polymer 80% lowers for AR-15s are available, some users have expressed concerns about their durability and safety due to thin walls and imperfections in the trigger pocket. It is important to note that building firearms from 80% lowers requires careful research and compliance with state and federal laws.
| Characteristics | Values |
|---|---|
| Material | Kevlar-reinforced polymer, plastic, aluminum |
| Advantages | Privacy, cost, customization, compatibility |
| Disadvantages | Fire safety issues, walls are too thin, not as durable as aluminum |
| Assembly | Requires hand tools, drill bits, end mills, a dremel, a lower part kit, Radlock, buttstock |
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What You'll Learn
AR15.com has a forum on 80% plastic lowers
AR15.com has a forum dedicated to 80% plastic lowers, with a particular focus on comparing two brands: Tennessee Arms and Polymer80. The forum also discusses the legality of 80% plastic lowers and the process of building them.
One user on the forum inquires about the durability of 80% polymer lowers for AR pistol builds, specifically asking about brand recommendations and the durability of polymer lowers compared to other materials. This user mentions that their friend built an AR pistol with a polymer lower, which turned out well, and they believe their friend used a Polymer80 product.
Another user shares their experience with an 80% lower made of Kevlar-reinforced polymer, explaining that it took them about an hour and a half to finish the build using various tools and a lower parts kit. They also mention that they received two additional lowers that looked significantly better, and they plan to call their build a BS-26 since it is not an AR series rifle pistol.
The forum also includes discussions about purchasing 80% plastic lowers, with one user mentioning a company in Parker, AZ, selling a complete polymer lower for $90. This user had concerns about the strength of the plastic and the paperwork required for the purchase.
AR15.com's forum on 80% plastic lowers provides a space for firearm enthusiasts to share their experiences, seek advice, and discuss the legal and technical aspects of building AR pistols with polymer lowers.
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80% lowers are not considered firearms under federal law
80% lowers, also known as "receiver blanks", are not considered firearms under federal law. This means that they are not subject to the same rules and regulations set forth by the ATF (Bureau of Alcohol, Tobacco, Firearms, and Explosives). In most states, it is legal to purchase an 80% lower without an FFL (Federal Firearms License).
An 80% lower is an unfinished receiver that does not have a serial number and is not fully machined. It requires additional drilling and cutting to become a functional firearm. According to federal law, an 80% lower does not require a unique serial number, even if it is later used to construct a firearm such as an AR-15.
The ATF has long held that items such as receiver blanks, "castings" or "machined bodies" with completely solid and un-machined fire-control cavity areas have not reached the "stage of manufacture" to be classified as firearms. As such, they are not considered guns by the ATF and are not subject to regulation under the Gun Control Act (GCA).
However, it is important to note that local and state laws may vary. Some states, such as California, require serialization of all firearms, including 80% lowers. In addition, the laws surrounding 80% lowers are subject to change, and there have been ongoing legal battles over the ATF's authority to regulate these items. For example, in 2022, the ATF issued rules classifying the components of 80% lowers as firearms under federal law, but these regulations were challenged in court and a Texas judge ruled that the ATF had overstepped its bounds.
In conclusion, while 80% lowers are not currently considered firearms under federal law, the legal landscape surrounding them is complex and ever-changing. Individuals interested in purchasing or constructing firearms using 80% lowers should stay informed about the latest laws and regulations in their specific state to ensure compliance.
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80% lowers are available in billet and forged aluminium, and polymer
80% lowers are a popular choice for those building their own AR-15s, as they allow for customisation, privacy, and cost savings. They are considered "receiver blanks" by the Bureau of Alcohol, Tobacco, and Firearms (ATF) and are not considered firearms under federal law as they are not fully machined and require further cutting and drilling to be assembled into a working firearm.
When it comes to choosing the material for your 80% lower, you have options like billet and forged aluminium, as well as polymer. Billet aluminium 80% lowers are formed from a solid block of extruded 6061-T6 aluminium, also known as bar stock. This type of aluminium is known for its strength due to the fabrication process, which involves heating the metal and forcing it through a die to create a solid shape. Billet lowers tend to be heavier due to the excess material left on for design and aesthetic purposes, but this weight difference is minimal compared to forged lowers. Billet lowers also tend to be more expensive due to the amount of material and labour required.
Forged aluminium 80% lowers, on the other hand, are made from 7075-T6 aluminium. This type of aluminium is super-heated and then hammered under intense pressure into a mould to achieve its final shape. Forged lowers are typically lighter due to their design differences and tolerances when compared to billet lowers. They are also generally less expensive than billet lowers. However, the forging process can create imperfections in the lower, and the excess aluminium that is removed can sometimes cause loose fitment when mated with the upper receiver.
Polymer 80% lowers, such as those made from Nylon-core polymer, are also an option. They offer lower costs, easier machining, and comparable performance to traditional alloy 80% lowers. Polymer lowers weigh significantly less than aluminium billet lowers, making them attractive to those concerned about the weight of their AR-15 build. However, polymer lowers have limitations when it comes to heat and sustained firing, as the Nylon-core polymer has a melting point of 473 degrees Fahrenheit, which could be reached with repeated rapid fire.
Ultimately, the choice between billet, forged, and polymer 80% lowers depends on your specific needs, preferences, and budget. Each material has its own advantages and considerations, and it's important to carefully research and understand the properties and limitations of each before making a decision.
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80% plastic lowers: Tennessee Arms vs Polymer80
When it comes to 80% plastic lowers, there are a few options available in the market, including Tennessee Arms and Polymer80. Both have their own unique features and benefits. Here is a detailed comparison between the two:
Tennessee Arms 80% Plastic Lowers:
Tennessee Arms offers a range of 80% plastic lowers that are known for their durability and strength. Their lowers are beefier than aluminum and feature brass inserts for the receiver extension, grip screw, and other components. This adds to the overall robustness of the product. Tennessee Arms products have been used extensively in competitions without any reported issues, showcasing their reliability. Their lowers are also available at competitive prices, making them a cost-effective option for enthusiasts.
However, some users have expressed concerns about the quality of Tennessee Arms' products, claiming that they are "junk" and that the company lacks sufficient knowledge about ARs. There have been instances where users have encountered alignment issues with the rear lug, which can impact the overall performance and accuracy of the firearm.
Polymer80 80% Plastic Lowers:
Polymer80 is a well-known brand in the world of 80% plastic lowers, boasting the largest community of builders. Their products are highly regarded for their weight reduction capabilities, as they are made from durable polymers that offer significant weight savings without compromising strength. Polymer80 lowers are also known for their customizability, as they can be serialized to comply with local laws and regulations, ensuring a unique serial number combination of letters and numbers.
While Polymer80 lowers offer weight advantages, some users have questioned their durability compared to aluminum options. The polymer construction may not be as robust as metal alternatives, and the cost of designing and tooling for improved durability can be significant. Additionally, the weight savings may not be substantial enough to justify the switch from aluminum for some users.
In conclusion, the choice between Tennessee Arms and Polymer80 80% plastic lowers depends on individual preferences and requirements. Tennessee Arms offers durability and reliability, while Polymer80 provides weight reduction and customization options. It is essential to consider factors such as intended use, cost, and local regulations when making a decision. Both options have their pros and cons, and it is always recommended to conduct thorough research and consult with experts before purchasing any firearm components.
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Users have discussed the pros and cons of AR-15 polymer lowers
One benefit of 80% lowers is privacy. Because they are not considered firearms, users can avoid FFL paperwork and invasions of privacy when purchasing. Another benefit is cost. By buying an unfinished receiver, users can save on manufacturing costs, avoid the "brand tax", and skip paying taxes and fees to the government. 80% lowers also allow for customization, as users can decide which parts to install and avoid paying for unnecessary parts.
However, some users have expressed concerns about the durability of polymer lowers, noting that they are not as durable as aluminum. Some users have also reported issues with the trigger pocket and fire safety, as well as problems with pairing polymer lowers with Mil-Spec uppers.
Despite these concerns, some companies have produced successful polymer lowers, such as the LW-15 by New Frontier Armory and the Omni lower by American Tactical Imports. Additionally, one user reported having four poly lowers with over 5,000 rounds out of them without a single failure.
Overall, while there are some mixed reviews of AR-15 polymer lowers, they can be a viable option for users who prioritize privacy, cost, and customization.
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Frequently asked questions
Officially called a "
80% lowers are available in billet (6061-T6) and forged (7075T6) aluminum, and polymer.
There are several benefits of using an 80% lower to build an AR-15. These include privacy, cost, customization, and compatibility.
Some popular options for 80% plastic lowers include the Tennessee Arms and Polymer80.
