Modern sports rifles in the M4 type have swept the United States. There are nearly unlimited options for the best M4 uppers in the market today, whether you’re designing your own rifle or replacing an existing upper.
The options might be overwhelming, but we’ve narrowed them down to a short selection of the top M4 uppers available today.
Aspects to Consider Before Buying
The first consideration in guns components is their dependability. M4 uppers also come in a variety of fit and finish options, which might influence accuracy. Going with a well-established firm and a proven model is the greatest approach to assure you obtain the most trustworthy and accurate goods.
It might be difficult to get the highest level of reliability at an inexpensive price, but that is exactly what we are here for. The fundamental distinction is between bare and full uppers. Choose the former if you want to customize every internal component of your firearm.
In terms of material and finish, you’re very certainly going to get an upper constructed of 7075-T aluminum alloy with a black mil-spec hard coat finish. Uppers made of billet provide more stylistic alternatives than those made of forged metal. Although forged uppers are presumably stronger, the difference will be minor. Some include additional coatings, such as Teflon or chrome-lining, to improve functionality and longevity.
Radical Firearms 16-In 5.56 M4 Upper Assembly
Radical Firearms is a modest Texas-based firm that has carved out a respectable market niche for itself. Their success is based on high-quality production that is backed by a lifetime warranty. In a 16-inch SOCOM configuration, this is a full mil-spec upper.
This is ideal for any shooter, new or experienced, who wants to pop a full upper receiver into their lower receiver and start shooting right away. Radical’s innovative 12-inch FCR free-float rail handguard system is a standout feature of this upper receiver. Thanks to the M-Lok thin rail, you’ll get the maximum accuracy while keeping barrel heat away from your hand.
The barrel is 4140 Chrome Moly Vanadium with a Melonite finish. It has a twist ratio of 1:7. At the very end is an A2 flash hider. The upper is built of 7075-T6 forged aluminum alloy with type-III anodizing, as is customary. The bolt carrier group has a nitride finish. The barrel nut is a Radical design that is exclusive and simple to use. A front assist and an ejection port door are included in this upper.
This is the solution for you if you require a high-quality, yet economical, upper that you can slot into your current lower and start shooting right away. Radical’s patented free-float handrail and barrel nut are the standout features.
Bravo Company – AR-15/M4 Flattop Upper Receiver Assembly
Another professional-grade upper from one of the most well-known brands in contemporary sports rifles. Veterans and ex-special forces men own and control Bravo Company. They design weapons based on their own fighting expertise and stringent requirements.
This upper is made to stringent military specifications. One exception is that the barrel extension’s interior diameter is slightly smaller to guarantee a snug fit and a more accurate gun. Laser T-markings on the top rail allow you to quickly and easily restore sights or other components to zero. To give more than enough strength, this top is CNC-machined from type-II, anodized 7075-T6 aluminum alloy.
It comes with a forward assist and an ejection port cover pre-installed. The front assist features a heat-treated tool-steel pawl with a pinned top and press fit. According to military regulations, the inside bore is lubricated with a dry film lubricant. This is a superb upper that has been built to strict standards and is available at a reasonable price. Bravo Company is rarely mentioned in a negative light.
This is a fantastic, high-end upper. Careful machining and strict tolerances have resulted in the best features. The barrel fit might be difficult, but the enhanced accuracy will be worth it.
Spikes Tactical M4 Flattop Upper
Spikes Tactical is a Florida-based family business. Their items are all produced in the United States and come with a lifetime warranty. With or without a forward assist, this handy little upper is a must-have. You’ll have to decide whether or not it’s required.
Since the introduction of the forward assist, advances in M4 design have arguably rendered the function obsolete. According to others, it might even worsen a traffic bottleneck. Others have referred to it as a lifesaver. An ejection port door is included with the forward assist option.
The M4 Picatinny rail on this flattop upper is standard. It’s made of 7075-T6 aluminum alloy and finished with type-III hard coat anodization in black. This is a high-quality, meticulously machined upper that provides excellent shooter pleasure.
The fit and quality are excellent. The variant without a forward assist or an ejection port door weighs 5.9 ounces, whereas the version with a forward assist weighs 8.5 ounces. Both variants are stripped-down, allowing you to pick and choose the internal components you want.
This upper receiver is of excellent quality and has been stripped down. You can’t go wrong with this selection, whether you want a forward assist or a sleek, pared-down style. The configuration flexibility and accurate machining are the main characteristics of this upper.
Brownells – AR-15 M4 Stripped Upper Receiver Black
Brownells is one of the country’s major dealers of firearms and weapon components. As a result, they have access to a plethora of information on what shooters desire, what works, and what works consistently. They put this expertise to good use by creating a number of low-cost, high-quality items.
Brownells offers a simple, no-frills but high-quality upper receiver to create your own bespoke M4 around with this stripped upper receiver. For this upper, Brownells selected a 7075-T6 aluminum alloy, which is the norm for most modern sports rifle receivers. This flattop upper is forged and CNC-machined to tight tolerances, allowing it to work with a wide range of ostensibly mil-spec AR components.
It features a type-III hard coat anodized finish that is matte black. Pivot/takedown holes and a T-marked Picatinny top rail are among the great touches added by Brownells. Of course, M4 feed ramps are included in this product for the most dependable feeding. With no forward assist or ejection port cover, this upper is as simple as they get. It is totally created in the United States of America.
If you’re a tinker and want to make your own basic, lightweight upper, this is a great alternative. The T-marked rail, general simplicity, and conventional, mil-spec measurements are the best characteristics. This is a fantastic, no-brainer choice from a reputable brand. Plus, buying things made in the United States is usually a good idea.
Conclusion
You now have a better understanding of the top M4 uppers available. Everyone has their own tastes, but we’re confident that you’ll find what you’re searching for on our list. In fact, why limit yourself to just one M4 upper? Experiment with uppers in improved, non-standard calibers by following our other recommendations.
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