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If you want to build your own AR-15, then this is the way to do it. Building your own AR-15 can be a very rewarding experience.
It’s a great way to learn more about firearms and to customize your gun exactly the way you want it. When you build your own carbine, you know every single part of the gun and you can be sure that it’s completely compatible with all of your other parts.
Drilling and assembling an AR-15 requires a few specialized tools and some know-how, but it’s not as hard as you might think. One of the things that makes building your own rifle so affordable is the existence of 80 lower receivers for AR-15 carbines.
When choosing an 80% lower receiver for your next build, there are a number of factors to consider. When it comes to aluminum AR-15 80% lowers in particular, there are commonly two choices — billet 80 lowers and forged 80% lower receivers.
An 80% lower receiver is a block of aluminum that’s partially completed. You can buy these lower receivers from reliable suppliers, like 5D Tactical, then you simply machine them into the final shape that you need.
All of our AR-15 lower receiver blanks are manufactured to precision tolerances and exhibit extraordinarily high quality. However, there are some minor differences between the forged and billet 80 lower receivers we carry here.
Forged 80 lower receivers are made from 7075-T6 aluminum that is heated and hammered into a mold, before being allowed to cool and finished via CNC machining. All mil-spec lower receivers are forged.
Billet 80 lowers, which can be made from either 7075-T6 or 6061-T6 aluminum, are machined from an extruded billet of aluminum (which is also finished via CNC machining). Billet 80 lowers may not be compatible with mil-spec components.
Forged 80% lowers, sometimes referred to as “Mil-Spec” lower receivers, are manufactured in a very different manner than billet 80% lowers. All forged 80% lowers start as “receiver blanks” that are formed (forged) under high heat and pressure into the general shape of an 80% lower.
There are only a handful of companies in the USA that are responsible for producing the majority of receiver blanks. These are then sold to machine shops and firearms manufacturers to complete the machining process.
Billet 80% lowers begin their lives as solid blocks of aluminum that are CNC machined from beginning to end, with varying designs available that will suit any style.
A billet AR-15 80% lower milled from 6061-T6 is multiple times stronger than required for the application. 6061-T6 billet 80% lowers are preferred by many for finishing an 80% lower at home, because the material produces an 80% lower that is easier to drill and mill for the user.
Still, some prefer 7075-T6 due to the increased hardness and tensile strength. Fortunately, our AR-15 Router Jig will make short work of either!
Two Types of Aluminum Used in Billet 80% Lowers
The two types of billet aluminum that are commonly offered for billet 80% lowers are 6061-T6 and 7075-T6.
7075-T6 is harder and stronger than 6061-T6, but that is largely unnecessary to a degree, as both are grades of aluminum that boast exceptional strength.
Besides mil-spec compatibility, there is very little functional difference between forged and billet 80 lower receivers. The chemistry of the aluminum alloy will affect hardness, heat resistance, corrosion, tensile strength, and more, but both our forged and billet 80% lower receivers are exceptionally strong.
You may be able to complete your own 80 lower at home. We encourage you to perform your own research and consult legal counsel to ensure you are in compliance with local laws and regulations.
However, the ATF does not consider either forged or billet receiver blanks to be firearms and does not regulate them as such. The ATF has also stated that it is legal to complete a receiver blank and assemble a firearm at home, provided the firearm is for personal use only.
Remember, this is federal law only and applies only to firearms created for personal use. State and local laws may restrict or prohibit the possession, sale, transfer, or alteration of forged or billet 80 lower receivers.
To complete an 80% lower receiver — whether it’s a forged or billet model — you’ll need:
The 15 80 lower receivers at 5D Tactical are manufactured from hardened aluminum alloys, such as aluminum 7075-T6 or aluminum 6061-T6. These provide a sturdy, dependable foundation that you can feel.
In order to qualify as Mil-Spec under U.S. regulations, AR-15 80s must receive a hardcoat anodizing finish. This is achieved by applying an electrical current while the 15 80 lower rests in a sulfuric acid bath.
The result is a 15 80% with remarkable durability. Fortunately for you, an overwhelming majority of AR-15 lower receivers for sale (including many of those at 5D Tactical) are hardcoat anodized.
It’s hard to choose, but our Black Anodized AR-15 80% Billet Lower is our best selling 15 80 — and we believe there’s a good reason for that. If you’re looking for something that’s built tough and is designed to last, this part is exactly what you need.
Made from aircraft-grade aluminum, it’s tough enough to handle whatever you can throw at it, and thanks to the black anodized finish, it will look great with any build.
The Billet AR-15 80% Lower is also compatible with most standard AR-15 parts and accessories. That means it’s easy to find aftermarket components that will fit.
That’s easy, select one of the many unparalleled AR15 lower receivers for sale at 5D Tactical. In fact, AR-15s ship the next day, and all orders over $300 ship free!
All forged AR-15 80% lowers are 7075-T6. The finished quality of a forged 80% lower depends on a number of factors, starting with the finish machining. Our Forged AR-15 80% lowers are precision CNC machined to tolerances of +/- .001″ and inspected thoroughly to ensure consistent quality.
Next, consider the presence and quality of the safety engraving. Our 80% lowers have the safety markings present (FIRE/SAFE for billet lowers, SEMI/SAFE for forged lowers), engraved deeply in large, bold print.
Finally, the quality of the hardcoat anodizing finish can make or break your build. A consistent, deep black finish that will match well with other hardcoat anodized components should be a major consideration. Our black anodized forged AR-15 80% lower receivers will arrive with a quality and consistent Type III Class 2 black hardcoat anodized finish completed per the standards set forth by MIL-A-8625. We also offer forged lowers in raw aluminum finish, for builders who intend to apply their own coatings.
We have Forged and Billet AR-15 80% lower receivers that are ready for your next custom rifle build project. Our lower receivers are precision CNC machined and are made of high-strength, high-grade aluminum.
Whether you want matched sets for upper-lower assembly or a complete 80 percent lower kit, we bring you superior quality products that you can always count on for reliable fit and finish. At 5D Tactical, we carry essential AR-15 80% lower parts including receivers, Mil-Spec lower parts kits, and upper/lower matched sets.
From the Engraved AR-15 Forged 7075-T6 80% Lower Receiver to our lightweight Billet AR-15 6061-T6 80% Lower Receiver with the look and feel of a Mil-Spec Lower receiver, we offer a selection of AR-15 80% lowers in a variety of styles. Whether you’re looking to build or upgrade a complete AR-15 80% lower, we have you covered.
At 5D Tactical, we have been specializing in AR-15s for many years. We employ firearms experts with more than 40 years of experience who are happy to answer any of your questions about your next build.
Do you want a forged stripped upper and 80% lower matched set? We have a complete set for your AR 15 80 percent lower receiver and upper receiver build project. Order your AR-15 80% Lower Receiver and the Mil-Spec AR-15 80% Lower Receiver Kit today.
As we said, whatever your project requires, you need a reliable collaborator that can provide the supplies and information you need. Here at 5D Tactical, we sell everything that you’ll need — forged and billet 80 lowers as well the upper receivers and 80 lower jig kits — to complete your project at home.
At 5D Tactical we’re passionate about DIY gun building, and we love sharing that passion with others. For more information on drilling, milling, and assembling your own carbine from an AR-15 80% lower receiver, reach out to our team today.
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