AR Uppers for Sale
Buy an AR upper for sale online at GunBroker! Ready to swap out your AR-15 upper receiver? Whether you’re looking for a complete upper for a quick caliber swap or a stripped upper for a custom build, we have thousands of listings that will get you what you’re looking for. You’ll find all of the AR parts you need to upgrade, replace, or build from scratch. You’ll also find AR-9 and AR-10 uppers and many other calibers available on the AR platform. While you’re here, you can learn more about guns and gun parts in our GunBroker Articles and Gun Review Videos. Shop for an AR upper with immediate checkout, or get the best deals by bidding on auctions!
Accept
Selected Filters
- Immediate Checkout - Credit Card
- Layaway Available
- Financing Available
- Free Shipping Available
- No Credit Card Fee
- Completed Items
- Take a Shot
- Sponsored On-site Listings
- Showcase Listings
- Charity Auctions
- Has Pictures
- No Reserve
- International Shipping
- Factory New
- New Old Stock
- Used
- Price Range:
- Collector's Elite Current
- Collector's Elite Upcoming
- Barrel Length:
- Caliber:
- Capacity:
- Frame Color:
- Gauge:
- Grips:
- Manufacturer:
- Model:
- Number of Rounds For Sale Per Quantity 1:
- Slide Finish:
- Exclude Words:
- Country:
- State:
- UPC:
- Keywords:
- Min Starting Bid:
- Max Starting Bid:
Results for
{{currentKeywords}}
Results for
{{currentCatName}}
Results for
{{currentKeywords}} in {{currentCatName}}
No results found or search too broad
Results for
ar uppers
5618 Items Found
Without the AR-15 upper, the AR lower cannot function, even though it’s the serialized part that is legally the firearm. Housing the critical components, including the barrel, bolt carrier group, and charging handle, it plays a key role in the modularity of the AR platform. Whether it’s an AR pistol or rifle, it has to have an upper. Here are some basics to help you understand the different types and features of the AR upper:
What is an AR-15 Upper Receiver?
The upper receiver is the top half of the AR platform that connects to the lower receiver to make a functional firearm. It contains parts that control the chambering, firing (except for the trigger group), and ejection of each cartridge. They are sold in two basic configurations, a stripped upper vs a complete upper:
- A stripped upper is just a bare shell with no other parts installed. This is what to look for if you want to do your own custom build.
- A complete upper receiver is fully assembled with the barrel, gas system, handguard, bolt carrier, and charging handle included. This is what to buy if you want to quickly swap your upper without building your own.
Components of a Complete AR-15 Upper Receiver
- The upper receiver body, aka the stripped upper.
- The barrel. AR barrels come in a wide variety of calibers and lengths, although the most common is a 5.56mm NATO caliber 16” rifle barrel.
- The gas system includes the gas block and gas tube for cycling and helps to mitigate some recoil.
- The handguard primarily protects the support hand from heat, but also provides space for Picatinny rails, M-LOK, or KeyMod systems for attaching accessories. Handguards are part of the overall system of AR stocks and forends/forearms.
- The bolt carrier group (BCG) contains the AR’s bolt, firing pin, gas key, and other internals. This is the “heart” of the AR-15 as it is critical for firing, reliable cycling, and lock-up.
- The charging handle is used to manually chamber a round and to clear malfunctions. There are ambidextrous options available for left-handed shooters.
- The muzzle device is really optional, but very common. It’s more uncommon to see an AR without a muzzle device than with one. This is usually a flash hider, compensator, or muzzle brake, but silencers/suppressors are becoming more and more popular every year.