The Basic Fundamentals of AR-15 Lower Receivers
While the AR-15 lower receiver is seemingly insignificant regarding the core mechanical performance of a gun, it is a crucial piece of your weapon. In fact, this single piece is what the ATF considers to be the “actual firearm” and thus requires you to purchase this part using the same standards you would for a finished firearm.
To understand a little more about this gun component, here are a few fundamental basics you should know:
What Is the AR-15 Lower Receiver?
In What Ways Can You Purchase a Lower Receiver?
• 80 percent lowers (typically purchased by advanced gun enthusiasts who like to build their weapons from the bottom up)
• Full lowers with all the lower pieces included
• Complete rifles
• Stripped lowers, which include only the most basic pieces
What Type of Materials Do They Use to Construct Lowers?
In addition to material, however, you also need to consider how the manufacturer creates the lower receiver. Manufacturers generally build lowers using one of three methods:
• Cast: A cast lower receiver is made from a mold using molten aluminum. After it solidifies, they remove the lower from the mold. While this method is expedient, it also creates a loose crystalline structure inside of the aluminum. While it is strong enough to be functional for sure, it is not the most effective method available for creating firearms of longevity.
• Milled: To make a milled lower receiver, manufacturers use a solid block of aluminum (also known as bar stock). While gunmakers mill most lower receivers at some point of their construction, they only process some from billets of aluminum. The strength of the bar stock will determine how reliable the final product will be. In most situations, a milled lower is stronger than a cast lower.
• Forged: If you are looking for the most reliable construction, then look no further than forged lowers. This construction method shapes the aluminum under pressure, hammering billets into molds. Then it is milled, creating a compression of the crystalline structure of aluminum that is long lasting and strong.
For more information on AR-15 lower receivers, call 22Mods4All at (561) 926-5888. Their helpful gun enthusiasts can answer any questions, provide tips, or address any concerns you may have with building your new, satisfying firearm.
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