9 Best AR15 Uppers

Whether you are building an AR15 or upgrading your current rifle. Here are 9 best AR15 uppers you just can't miss out. Some might think that all AR-15 uppers are identical. In reality, there are different types, such as the A1, A2, A3, and A4, each with its unique features and specifications.

Different manufacturers might use different materials or manufacturing processes for their uppers, leading to variations in weight, strength, and durability. 

So here are 8 best options

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Best AR-15 Uppers [For Upper Swap & Build From Scratch]

Geissele Super Duty Upper

The Geissele Automatics Super Duty upper has a tough 16-inch barrel made using a cold hammer forging process. This barrel is chrome-lined, so it lasts longer and works smoothly. It's also coated with Manganese Phosphate, which helps it resist rust. You can easily attach your favorite muzzle tool because the barrel is threaded with a 1/2x28 pattern.

The main part of this assembly, the upper receiver, is made of strong 7075-T6 aluminum. It's coated in a desert dirt color to protect it from rust and scratches. Attached to it is a 15-inch handguard with a locking notch that goes right into the receiver to prevent loose fit. The SMR MK16 handguard lets you add custom parts because it has M-LOK slots on seven of its sides. 

Palmetto State Armory JAKL 8.5"

The 300 Blackout caliber offers a potent combination of power and versatility for the AR-15 platform. It outperforms the 5.56 caliber when used in short-barreled rifles or with subsonic ammunition, making it an excellent choice for those looking to . 

PSA make a lot of stuff for the AR-15, including .300 Blackout uppers. While most options are the typical AR15 uppers. This one is a AK / AR hybrid upper receiver with left or right side charging handle, to make your 300 Blackout build standout. It's like a FN SCAR mating with an AR 15 lower.

All you need is the JAKL buffer system or use the PSA JAKL lower build kit to work with a standard AR15 lower, the rear adapter plate is what you really need.

Two different colors are offered: Black & FDE

Aero Precision M4E1 10"

Aero Precision makes high-quality AR parts. The ATLAS S One handguard is so lightweight by removing most of the material in areas that users don't typically mount accessories. The receiver doesn't feature forward assist to save even more weight.

This one is great for building a high speed competition shooting rifle.

BCM MCMR 9" 300 Blackout Upper

The BCM Upper Receiver Groups stand as a testament to unmatched durability and lightweight design, making them an ideal choice for anyone keen on crafting a robust AR15. These upper receivers are not just about aesthetics; they are about performance. Their design is optimized for swift movements, perfect for situations that demand quick reflexes and adaptability. Whether you're maneuvering through confined areas or taking shots while on the move, the BCM ensures you stay one step ahead in any tactical setting.

Beyond its standard AR components, the handguard has enough mounting space to attach anything you want. Its MLOK slots on every side are strategically positioned, allowing users to easily attach lights, modular grips, and sling points.

Radian Weapons MOD 1 Upper Kit

Radian makes the Model 1 Upper Receiver and Hand Guard by carefully using a CNC machine. They make sure they're strong in the important spots. The upper receiver is made from a special aluminum called 7075-T6. It comes with a dust cover, a pin that stops the hand guard from turning, a light forward assist, and a Raptor-SD handle that works from both sides.

The hand guard lets you attach Magpul® M-LOK® accessories. It connects to the barrel nut with four strong bolts that won't rust because they're covered in black stuff. All the edges are smooth, so they won't hurt you. To make them look good, Radian sprays them with a special paint called Cerakote.

Brownells BRN-180 Gen 2

The BRN-180S® Gen2 is in collaboration with PWS and FM Products, they've integrated upgrades inspired by the AR-18/AR-180 rifles from the 1960s, innovations originally conceived by Eugene Stoner, the genius behind the AR-15. The BRN-180® stands out for several reasons: it utilizes a dependable gas system and doesn't require a buffer tube, making it perfect for folding stocks.

It can even fire when the stock is folded. Users can adjust the gas to fit a silencer, and its sturdy handguard, equipped with tool slots, can be removed with a single screw. Moreover, it's compatible with any standard AR-15 lower part. Alternatively, users can pair it with a dedicated BRN-180 lower component.

Buyers can choose the BRN-180 and BRN-180S Gen2 in three ammunition varieties: .223 Wylde, .300 Blackout, and 7.62x39mm. These barrels, crafted with precision, are available in three lengths to suit pistols, short guns, and long guns.

Daniel Defense MK18

The Daniel Defense MK18 AR-15 Pistol Upper Assembly is your best pick for crafting a formidable, battle-ready rifle. Inspired by the US Navy's Mk18 Mod 1, it boasts a 10.3-inch barrel made from elite 4150 Chrome-Moly Vanadium Steel, ensuring maximum durability and rust resistance.

The M4 feed ramps guarantee reliable ammo feeding, and the true 5.56x45 NATO chamber accommodates both standard and high-pressure rounds. With its robust bolt and carrier undergoing rigorous testing and a 9.5-inch tactical Quad-Rail Handguard for accessory attachments, this upper is built for performance.

Paired with its Daniel Defense Flash Hider and compatibility with AR-15 pistol lowers or approved SBRs, the MK18 is the top choice for those aiming to build a resilient and efficient fighting rifle. Remember, its design allows for versatile customization while upholding the highest standards of strength and reliability.

Daniel Defense M4A1 14.5 Upper MLOK

The Daniel Defense M4A1 upper has always been a choice for tactical shooters. The overall build quality of this upper receiver is the same as the MK18. What makes it special is the brand new RIS III handguard with MLOK slot (~1 lb lighter than the RIS II handguard).

Build your ideal 14.5 rifle with this Mil-Spec Upper Receiver. It has a mid-length gas system and a government profile 14.5-inch barrel. The custom AR15 Upper Receivers come with a pinned and welded DD extended flash suppressor attachment, Grip N Rip charging handle. Parts are all machined from anodized aluminum, they're durable, lightweight, and resistant to corrosion.

These DD upper receivers have M4 feed ramps for quicker reloading, while the M-LOK handguard provides a secure space for mounting optics, laser sights, and other rifle accessories.

BRN 4 (HK 416 Clone)

The HK416 is a popular version of the AR-15 that uses a piston. Many people like it, but it's hard to find and costs a lot in the U.S. Now, thanks to Browells, you can get the same performance at a better price with the BRN-4 Piston Upper Receiver Kit!

The top parts in the kits are real ones from HK Germany. Browells got them in a special deal a while back. These German parts might have some wear and there aren't many. Once they're gone, they won't come back.

The kits have barrels in three sizes: 10.4”, 14.5”, and 16”. They can be thick or medium. Faxon made them, and they use a piston system and take 5.56 NATO bullets.

You can buy the whole kit for $1,500. Or, you can buy just the parts you need.

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