300 Blackout Upper Receiver Aero Precision

The Aero Precision M4E1 Threaded Barreled Upper Receiver is chambered in .300 AAC Blackout. This upper offers the total package with unrivaled strength and reliability allowing you to confidently navigate any scenario. This Aero Precision M4E1 Threaded upper receiver group comes completely assembled with 8" .300 Blackout barrel and a pistol length gas system to ensure reliable function. Forged from 7075-T6 aluminum, this upper receiver features a billet design at a much lower cost and looks great when paired with the M4E1 lower receiver. The ATLAS S-ONE free float handguard is made from the same material with the same hardcoat anodized finish and features a lightened profile with M-LOK slots for accessories. This .300 Blackout AR-15 barreled upper receiver assembly does not include a BCG or charging handle but does include the forward assist and dust cover.

Build a high quality .300 BLK AR pistol today with the M4E1 upper receiver assembly. The flash hider that comes with this complete upper receiver is NOT pinned nor welded to this barrel. Per the National Firearms Act, the muzzle brake MUST be pinned and welded to achieve the necessary 16"" as defined by the ATF for a rifle build. Muzzle brake that comes with this complete upper receiver is NOT pinned nor welded to this barrel.

Per the National Firearms Act, the muzzle brake MUST be pinned and welded to achieve the necessary 16 inches as defined by the ATF for a rifle build. The muzzle brake that comes with this complete upper receiver is NOT pinned nor welded to this barrel. Per the National Firearms Act, the muzzle brake MUST be pinned and welded to achieve the necessary 16" as defined by the ATF for a rifle build.

Lastly, this is a complete upper receiver, so it does include a charging handle and bolt carrier group. The S&W M&P Whisper is a simple system that's easy to suppress and rearing to go out of the box. A 10-inch barrel on an AR pistol or a short barreled rifle is perfect for the .300 Blackout. The uppers all feature different length handguards, that accommodate the mounted flash suppressor.

The barrels are all equipped with a standard A2 muzzle brake that's been proven efficient and effective. This complete upper includes our new ATLAS S-ONE Handguard! The S-ONE line of handguards are designed with size and weight in mind, providing the perfect addition to your lightweight build. News people Radial pistol uppers are good to go for what they are designed to do. The only down side would be the barrels are 4140 so I would guess they won't hold up to high round counts. But at their price point I can buy a complete upper for the cost of a barrel from other name brands.

I've found two options that I really like that come without barrels. These are high-end uppers that are designed for builders who really want to tweak their builds. The end user will have to provide a barrel and gas system to the upper receiver to complete it. When given a shot at reviewing an Aero upper receiver , I chose the M4E1 upper with a 16″ 300 BLK barrel (1/7″ twist) and a keymod rail. The "E" in the name is for enhanced.The area specifically being described here is the handguard and barrel mounting system.

The handguard mounting system and upper receiver are part of the same forging, making it an ultra-strong setup that is likewise simple. One can slide his barrel assembly into the upper, tighten using the included wrench, then toss on the rail and button it all up with eight screws. This system works not only with Aero precision's handguards, but also most BAR system handguards.

It's a Smith and Wesson product, what could really go wrong? This is as traditional an upper receiver as you'll get in the modern world. This is for a full-sized carbine and comes outfitted with a 16-inch barrel with a 1-7.5 inch twist, and a threaded muzzle. Included is the Yankee Hill Phantom flash suppressor, which is a great touch. From Brownells, you can get it with either an 8.7" or 14.5" 416R stainless steel barrel that guarantees Sub-MOA accuracy with Black Hills Match Grade ammo. Its billet upper receiver and M-Lok handguard are incredibly high quality and look fantastic.

You can find barrel lengths from 8" to 16", options with or without a bolt carrier group and charging handle, and a variety of handguard configurations. Photo by Rex NanorumI took the M4E1 out to the range with a couple hundred rounds to use. I had five different loads available, all pictured below. Ranging from 90 grains to 220 grains, this is a nice variety of rounds with which to test accuracy.

The M4E1 was a snug fit in all three lower receivers I own, but too snug in the lower that contains a match trigger. Given a 1-turn-in-7-inch barrel, this usually means the gun will favor the mid weight and heavier bullets. The 16-inch option even comes complete with gas block and gas tube. Brownells isn't going to stick their name on crap either.

These barrels are made of 4150V steel and feature a Nitride finish for strength and durability. This includes magazines, bolt carrier groups, upper and lower receivers, rails, buffers, buffer assemblies, stocks, etc. Really, the biggest change is the barrel and the gas system. Aero Precision 300 Blackout M4E1 ATLAS S-ONE Complete Upper is the most efficient way to assemble your own custom firearm; fully assembled and warrantied by Aero Precision. The S-ONE handguards are designed with size and weight in mind, providing the perfect addition to your lightweight build.

This upper does not come with a bolt carrier group or charging handle. If you're in the market for a BCG, you can't go wrong with BCM Mil-Spec BCG. I run this on nearly all of my AR-15s. You can also check out our guide to the best charging handles. In recent years, 300 ACC Blackout has become one of the most popular calibers for AR platform rifles.

Because regularly swapping out barrels is a pain, most people to choose to buy a 300 Blackout upper. This Upper Receiver Handguard Combo now includes the Gen 2 Enhanced Handguard! Key features include the addition of quick disconnect sling sockets, enhanced milling design for grip and visual appeal and a new profile for the picatinny top rail. This list definitely should be updated to include gas piston systems.

Primary Weapons Systems sells a complete upper exclusive on Brownells that is competitively priced compared to the others on this list, but you get a far superior action. With suppressors and SBRs being all the rage the .300 Blackout continues to grow. The ammo price continues to drop, and upper receiver options are everywhere. We all have a budget to live and die by and recognizing that I'd suggest any of the .300 Blackout options from Radical firearms. These budget-priced uppers lack a BCG and charging handle, but they'll take any standard AR BCG and charging handle.

The .300 Blackout is designed for short barrels so we gotta have a teeny tiny upper on this list. Aero Precision is one of the best companies out there for modern, high-quality AR components. The M4E1 comes available in 8, 10, and 16-inch barreled options. They have utilized their knowledge from years of building aircraft components to design and engineer AR-15 handguards, receiver sets, scope mounts, and more.

These Aero Precision M4E1 Complete Uppers with .300 Blackout Barrels are equipped with Chrome Moly Vanadium barrels. Along with solid fit and finish, these AR15 Upper Receivers from Aero Precision come with Gen 2 Enhanced free-float handguards with Picatinny top rail and a choice of rail types on the other 3 faces. These Aero Precision M4E1 Complete Uppers have been MPI and HP tested and are compatible with standard AR15/M4 components. Get more power, precision and accuracy when you upgrade to one of these Aero Precision M4E1 .300 Blackout Complete Upper Assemblies. Is this barrel able to be used on my S&W MP 15 and what if any other changes do I need to make I.E. charging handle or bolt carrier.

This Complete Upper includes our Gen 2 Enhanced Handguard! It comes with an Enhanced full-auto rated bolt carrier group and Radian's Raptor-SD charging handle that is optimized for use with suppressors. While you could spend more to get a lighter or slightly more accurate upper, PSA's options get the job done in terms of reliability.

They're great choices if you want to dip your toes into 300 Blackout or if you're on a budget. With their wide range of available configurations, you can find an upper to put together a great pistol or rifle. This complete upper does not include BCG or Charging Handle. Photo by Rex NanorumI'll note I've never been uber proficient at nice tight groups.

I've always been far more successful at speed shooting, so I dialed the Leupold back to 3x and spent the rest of the day shooting and transitioning back and forth across the range. Despite a generous 1.8″ inside diameter on the keymod rail , this is a light and responsive upper. Having forgotten my weapons lube in my other range bag, some 10w30 motor oil kept the BCG running smooth and reliably. My first experience with Aero Precision came about 10 years ago in the form of a stripped lower.

The build went well and the lower was a breadcrumb on the trail to more parts from Aero. As a gun shop owner, when customers were looking for quality parts at a price that wouldn't break the bank, Aero was often the recommendation. I do want to note one thing before you run out and get a new .300BLK upper – you NEED to be careful when switching between uppers or even when you have a dedicated .300BLK rifle and a 5.56 rifle.

You see, .300BLK can chamber in most 5.56 barrels, however, if you try to shoot it – your barrel will literally burst. This upper features a unique barrel nut that holds the system together. Extra barrel nuts can be purchased to quickly and easily swap barrels.

This allows you to switch from 5.56 to .300 Blackout with a simple barrel change. This receiver and handguard are designed to be a takedown model. This allows you to detach the handguard and barrel from the upper in seconds.

This system is available with both a 13-inch handguard and a 7-inch handguard so you can go rifle or SBR/pistol route. These uppers range from 8.5-inch barrels to 16-inch options. Radical firearms also produce their uppers in a wide variety of configurations. You can pick and choose between Keymod, MLOK, or quad rails. Key features include the addition of built in anti-rotation tabs, removable 4-slot picatinny rail section for front sight and a 7 mounting surface for accessories.

Occasionally an item may appear on the site by mistake or the item's description may contain a typographical error. We do not guarantee that titles, descriptions, pictures or prices on our site are error-free. We reserve the right to refuse any order including but not limited to orders for items with errors in the description or price. In the event that we cancel an order we will not charge the customer's credit card or we will refund the money. Despite my challenges keeping the groups as tight as I would like, I had no troubles banging various sized targets from 50 to 300 yards with speed.

Towards the end of the day I had really begun to realize this upper is capable of much better accuracy than I am. The M4E1 is light, rigid and speaks of quality at every turn. At $460 from aeroprecisionusa.com, this is an upper I'll recommend. Once I get another range trip in, I'll update with more accuracy results. I have recently joined an Anderson lower with a upper receiver that I got from Bear Creek armory for something around $200.

It carries a silencer central can and my property is super densely forested very few clear long shots so this is absolutely perfect for me. Just make sure and meet ATF's guidelines for AR-15 pistols. Personally, I keep them organized by using different color mags – FDE and black for 5.56 and Olive Drab for .300BLK. I also double and triple check things before loading a mag into the rifle. The upper is a billet design that's pleasing to the eye, and the handguard is a modern MLOK model. It's a well-made, premium upper receiver that will serve you for years and years.

The ability to take the barrel off and on in a flash opens up all sorts of possibilities. Another is the ability to create a compact truck gun designed for easy storage and transport. This kit does require a proprietary barrel wrench, but it is included with the upper. To install a barrel there is a small access hatch at the bottom of the rail system. My personal favorite is the 8.5 inch upper with an MLOK rail.

It's short and sweet and perfect for a .300 Blackout pistol or SBR. The MLOK rail is fantastic and provides more than enough room for accessory attachment. They are mil-spec, and all feature flat top uppers, forwards assists, and threaded barrels. Prices range, but each option is affordable and thoroughly modern. Aero makes gear that works, and these uppers are perfect for your next .300 Blackout build or to convert your 5.56 rifle. The uppers all sport a pistol length gas system that works perfectly with the .300 Blackout round.

These uppers are outfitted with Keymod rail systems for easy accessorizing and lightweight rail option. Thus, most people decide to buy a 300 Blackout upper so that they can quickly slap it onto a complete AR-15 lower they already own. This not only saves you money, but you can get a 300 BLK upper shipped straight to your door in most states because the lower receiver is the serialized portion of an AR-15. Just remember to comply with all federal, state, and local laws surrounding barrels under 16".

If you are not satisfied with your purchase, pleasecontact usfor a Return Merchandise Authorization request within 30 business days of the receipt of the product. All products must be packed in the original packaging, including any accessories, manuals, documentation and registration that shipped with the product. This was delivered in a timely fashion and nicely packaged in Aero Precision original box. I have yet to build anything else around this yet and certainly haven't put any rounds through it but I'm very happy with the initial observed quality. Aero holds up to their reputation for best quality on a budget and Wing tactical made for quick and easy transaction. Only 4 star review since I have yet to put any rounds through it.