The AR-15's split personality allows a single lower assembly that has a standard size lower receiver to be connected to different uppers chambered in a variety of calibers.

Ruger's AR-Lower Elite is a fully assembled, full-featured modern sporting rifle lower receiver. Featuring the Ruger® Elite 452™ AR-Trigger, Magpul® MOE® SL stock and Magpul MOE grip, the AR ...

Set the complete upper assembly on top of the lower receiver and pin the two halves together. Run a quick check to make sure all the correct and necessary components are present and cycling smoothly.

Looking for a slightly different looking AR15 lower receiver? If so, Seekins Precision may have what you are looking for with their AR15 ambi-lower receiver. This lower is cut from a T-7075 ...

I ordered every part of my AR-15 but the lower receiver from the website of Ares Armor, a Southern California gun seller that doesn’t require any personal information beyond a shipping address.

The lower receiver – which houses the trigger assembly, magazine well, and pistol grip – is the only AR-15 part classified as a firearm under federal law, and it requires a background check to ...

Now, a group dedicated to 3D-printing firearms announced the development of a design for a Colt CM901 rifle's lower receiver -- and it's available for download off the Internet.

The modular design of the AR rifle is a big part of its enormous popularity. By simply popping the takedown pins and switching the upper receiver assembly an AR owner can switch from a .22 long ...

What exactly is a gun, after all? The lower receiver part of a firearm is the crucial part that contains all of the gun's operating parts, including the trigger group and the magazine port. (Under ...

The polymer lower receiver appears to be manufactured differently with two parts, making them a firearm and illegal sell, according to the ATF.

The Ghost Gunner is a small CNC milling machine that costs a mere $1200 and is capable of spitting out an aluminum lower receiver for an AR-15 rifle.