ar15 upper

An AR-15 upper receiver is the heart of your rifle’s performance — the assembly that houses the barrel, handguard, and bolt carrier group and determines your caliber, accuracy, and handling. Because the upper is not the serialized part, a complete upper can ship directly to your door with no FFL, making it the easiest way to change calibers, upgrade a rifle, or build out a lower you already own. This category covers complete and stripped uppers and what to look for. Pair an upper with a lower receiver and bolt carrier group to build a complete AR-15.

Tatted Tacticals stocks AR-15 uppers from leading makers — complete uppers ready to run, barreled uppers, and stripped uppers for custom builds, in popular calibers and barrel lengths.

Complete vs. Stripped Uppers

A complete upper includes the barrel, handguard, gas system, and usually the bolt carrier group and charging handle — essentially ready to drop onto a lower and shoot. A stripped or barreled upper gives builders a starting point to add their own parts. For most buyers, a complete upper is the fast path: choose your caliber and barrel length, and you can transform or expand your rifle in minutes. No FFL is required since the upper isn’t the serialized firearm.

Choosing an Upper

Key decisions include caliber (from 5.56 to .300 Blackout and beyond), barrel length and profile, gas system length, and handguard style. Side-charging uppers offer an alternative charging method some shooters prefer. Ensure compatibility: standard AR-15 uppers fit standard AR-15 lowers, but AR-10/.308 uppers require AR-10 lowers — the two are not cross-compatible. Match your upper’s caliber to a compatible bolt and magazines. Add sights or a red dot to complete it.

Buying an AR-15 Upper

Complete and stripped uppers are not firearms and ship directly without an FFL. Some states restrict certain rifle features or configurations, so review our state restrictions and verify local laws before ordering. Always follow the four rules of firearms safety, with additional guidance from the NSSF.

AR-15 Upper — Frequently Asked Questions

Do you need an FFL to buy an AR-15 upper?

No. The upper receiver is not the serialized part of the rifle — the lower receiver is — so complete and stripped AR-15 uppers ship directly to your door without an FFL transfer. This makes uppers an easy way to change calibers or upgrade your rifle. Only the lower receiver and complete firearms require FFL transfer. State feature laws still apply, so check local rules.

Can you put an AR-10 upper on an AR-15 lower?

No. AR-10/.308-pattern uppers and AR-15 uppers are different sizes and are not cross-compatible — an AR-10 upper will not properly fit an AR-15 lower, and vice versa. Standard AR-15 uppers fit standard AR-15 lowers. When building, match your upper and lower to the same platform (AR-15 or AR-10) for proper fit and function.

What is a side-charging upper?

A side-charging upper relocates the charging handle to the side of the receiver instead of the traditional rear position, letting you charge the rifle without breaking your firing grip or cheek weld. Some are non-reciprocating for comfort. It’s a popular alternative for shooters who prefer the ergonomics, and useful on optic-heavy or precision builds where the rear charging handle is awkward to reach.

What caliber upper should I get?

It depends on your use. 5.56/.223 is the versatile all-around choice for general use, target, and defense; .300 Blackout excels for suppressed and short-barrel use; and other calibers serve specialized roles. Choose based on your purpose and ensure you have the matching bolt and magazines. A complete upper in your chosen caliber drops onto your lower for an instant caliber change.

Can you buy an AR-15 upper online?

Yes. In most states you can buy a complete or stripped AR-15 upper online and have it shipped directly to your door without an FFL, since it isn’t the serialized firearm. Some states restrict certain rifle features, so confirm your local laws before ordering. It’s one of the easiest and most popular ways to upgrade or expand your AR-15.