BRN-15 M4 STRIPPED LOWER RECEIVER 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 Lower Receiver is that component - the perfect starting point for many an AR-15 build.

Starting with a 7075 T6 aluminum forging, our stripped M4 Lower Receiver 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
Threaded bolt catch pin for easy installation

The Brownells M4 Stripped Lower Receiver is a top-tier lower receiver, at a great price.

See all of our AR15s and AR15 parts here.

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Reviews Summary

The BRN-15 M4 Stripped Lower Receiver has mixed reviews. While some users appreciate its budget price and decent fit, many are frustrated by overly tight magwells that hinder magazine compatibility. Additionally, cosmetic blemishes and quality control issues have left several customers disappointed, suggesting this lower may be best for those willing to invest time in modifications.

What Reviewers Are Saying

Magwell Fit

70%

A significant number of reviewers report issues with the magwell being too tight for both PMAG and USGI magazines, making it difficult to insert and remove magazines without force. This issue is considered a major flaw, with many stating it could potentially lead to dangerous situations.

Quality Control

65%

Several reviews mention cosmetic flaws and blemishes, indicating inconsistent quality control. Some customers expected better anodizing and overall finish for the price and were disappointed with the imperfections present in the product.

Value for Money

55%

Despite the defects reported, many users still find the lower receiver to be a reasonable choice for the price point, particularly for budget builds. Reviewers acknowledge that while the product has flaws, it offers essential features at an affordable rate.

Customer Support Experience

40%

Some users experienced delays and challenges in receiving replacement products from customer support, leading to frustrations about the communication and return process. However, positive instances were also noted where support was helpful after long waits.

Ease of Assembly

30%

Although the product has several issues, some reviewers praised the assembly process, aided by helpful tutorial videos. Users found it relatively straightforward to build with the lower receiver, which is a plus for novices.

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Mags don't fit

Magazines don't fit whether it be a PMAG or a USGI mag, after filing and fitting the mag well the mags now won't release. The Bottom is line to avoid these since you can't return them also I'd like to thank Brownells for having me waste my money on multiple FFL transfers just for some neat paperweights.

3 out of 4 lowers horribly out of spec

I purchased 2 of these lowers and once I got them I realized magazines would not fit in the magwells (this is a problem) I then got a replacement pair sent by Brownells after a very long time trying to get an email response. The 2 they sent as replacements were supposedly examined by a gun tech prior to shipment to ensure they were in spec and functional. Of the 2, only one of them allows mags to be inserted and removed without forcing them. I tried a large variety of magazines including brownells brand usgi style magazines and magpul pmags. Don't waste your time and money on this.

Get something else.

I'm building a project for myself on this lower. I was attracted to this because its a 70 dollar lower. ISSUES: Brownells did not, DID NOT, mark who this lower was supposed to go to so my FFL nearly put it on sale because it wasn't marked. Thanks for that shipping department. The next issue is that the magwell is out of spec. I ended up taking a old Soviet metal file to the magwell to fit USGI magazines and PMAGS. I'm going to end up replacing it with a Aero Lower on this project once I get a chance.

Bad machining

You probably read other reviews saying the magwell is too tight for gi or metal mags. You probably also be like How bad could that be? and decided to try one. I did so and I regret it big time: GI mags fit tightly not only because the magwell is narrow, but also because the whole port or magwell opening is not machined parallel to the sides of receiver! I bought two of these and they both got that inclined mag well. Might be issues on the machine setups or whatever. I suggest until this issue is addressed by brownells just dont buy these lowers.