AR 15 Upper for Sale – Buy an AR 15 Upper Online

Looking for information on AR 15 uppers? Here at we’ve gathered some info for you to peruse. After all, it’s a good idea to be informed before making important buying decisions about your firearms and their accessories. There’s a huge selection of AR 15 upper receivers out there from a variety of manufacturers – take a moment to read a little about the general design of the AR 15 upper and the history of this gun before heading over to our auction pages to find the perfect AR 15 upper for you.

AR 15 Upper Design

The AR 15 was designed to be modular, allowing it to be easily customized to the task at hand with different parts and accessories. Based on the fully automatic M16, AR 15 semi automatic rifles can be dismantled and reconfigured in a variety of ways by its civilian operator. While there are many configurations possible due to large amount of manufacturers creating parts and accessories, AR 15s cannot legally be converted to fully automatic weapons due to federal laws. Some manufacturers will mark their AR 15 style rifles with a faux selective-fire switch for the sake of re-enactors and collectors, but the rifle will only fire in semi automatic mode.

The upper receiver of the AR 15 is the most customizable feature of the rifle, allowing for different stock lengths, sights and different barrel variants. Many barrels offer different weights and even calibers, allowing each shooter to hand-pick their preferred ammunition. It should be noted, however, that some upper receivers with certain caliber barrels may require adjustments to the lower receiver in order to work optimally. Some companies offer strengthened AR 15 upper and lower receivers made from a solid block of aluminum rather than aluminum forging.

AR 15 Uppers for Sale Today

There is a huge array of AR 15 upper receivers out there – and many types and brands are for sale right here at! Our auction listings update every day, so remember to check back later if you don’t see exactly what you’re looking for today. Thanks for reading our brief on AR 15 upper design!


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AR 15 Upper in AR15 Parts

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