AR-15 M4 STRIPPED UPPER RECEIVER BLACK Reviews & Ratings

Sometimes you want the latest, updated, tweaked component, and sometimes you need a basic stripped receiver where the production effort goes into quality, rather than bells and whistles. The Brownells M4 Stripped Upper Receiver is that component - the perfect starting point for many an AR-15 build. Starting with a 7075 T6 aluminum forging, our stripped M4 flattop upper is precision machined to final dimensions that make it compatible with the multitude of available "mil-spec" AR-15 components. It has a matte black, Type III hardcoat anodized finish, mirroring the military requirement.

Machined from 7075-T6 aluminum forging
Matte black Type III hardcoat anodized finish
Mil-spec dimensions for maximum parts compatibility
Standard .250" dia. pivot/takedown pin holes

Inside our upper features M4 feed ramps to aid in chambering during high rates of fire. Please note: this is a truly stripped upper receiver, with NO forward assist or ejection port cover installed, so you can truly customize every aspect of your rifle. The Brownells M4 Stripped Upper Receiver is a top-tier upper receiver, at a great price.

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Reviews Summary

The Brownells AR-15 M4 Stripped Upper Receiver impresses users with its great fit and finish, making it a solid choice for builds, especially at its competitive price. While some reviews mention minor issues with fitment and finish, overall satisfaction remains high, with many recommending it for both budget and custom builds.

What Reviewers Are Saying

Fit and Finish

80%

Many reviewers praise the overall fit and finish of the upper receiver, noting it provides a perfect fit with various lowers, including Aero Precision and S&W. Although a few reported slight gaps or imperfections, the consensus is that it meets or exceeds expectations for build quality.

Value for Money

75%

A significant number of reviewers highlight the exceptional value this upper represents given its low price compared to competitors. Customers appreciate that it offers quality similar to higher-priced options, making it an attractive choice for budget-conscious builders.

Compatibility

70%

Reviewers frequently discuss the upper's compatibility with various lower receivers and parts kits, including those from Aero and Anderson. Most find it fits well with minimal issues, enhancing its appeal for custom AR builds.

Customer Experience

60%

Customers often mention positive experiences with Brownells' customer service and shipping. While some noted minor issues with packaging that resulted in cosmetic blemishes, the overall feedback on service quality remains favorable.

Minor Fitment Issues

40%

Some reviewers encountered minor fitment problems, such as tight tolerances and minor gaps, specifically when pairing with certain lowers or components. However, these issues are generally seen as manageable and do not significantly detract from the overall quality.

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Good product

This upper checked all the boxes for my building needs. Ive ordered two so far. The first one I received l was sure had been returned and Brownells was willing to exchange, but the slight scuffs in the BCG area wasnt enough to deter me and set my schedule back. I would like it it the product had been listed as blemished. The second wasnt pristine, very slight nicks in anondizing that I noticed on the first upper too. The quality of the upper isnt in question though and the price is outstanding.

Check before lapping barrel nut thread

Before lapping the upper barrel nut thread, make sure to insert barrel and check the feed ramp. For me, without lapping, the barrel is sticking out At the feed ramp...

Good, but...

The upper is solid and fit my Anderson lower nicely. The downside was that the dust cover does not want to snap close easily. I thought it was the dust cover at first, but comparing the milling where the dust cover closes on this receiver compared to another AR upper, the groove is noticeably less and smaller.

Matches my Ruger lower perfectly

I would have given it 5 stars if it wasn't for the fitment. 3.5 more like it. Has a good matte black color, does not scratch easily. But I had to sand down the rear kickdown block. I added pictures of what I mean. Also very tight tolorences on the buffer tube, if ANY threads stick out a bit it will not close. I had to back it out a bit, still enough to keep the pin in but I didn't like that either. Will use it for a bit and see how she works but will likely upgrade at a later date.