Summer Cleanout Sale!
Huge Savings On 2000+ Items From 200+ Brands - SHOP NOW

Daily Deal: Brownells Short Canvas Shop Apron ~~$29.99~~ $19.99- Get Yours!

BRN-180M STRIPPED LOWER RECEIVER BLACK AMBIDEXTROUS Reviews & Ratings

BRN-180M STRIPPED LOWER RECEIVER BLACK AMBIDEXTROUS

The Brownells BRN-180M® Lower Receiver is specifically designed to pair up with the BRN-180® Upper Receivers to maximize the full potential of this unique line.

The new BRN-180M is now fully ambidextrous and includes ambidextrous bolt release and an ambidextrous magazine release. The ambidextrous magazine lever was designed to work in conjunction with the standard Mil-spec magazine catch for proper function. The new BRN-180M includes the ambidextrous bolt release and magazine release lever hardware.

While designed to be fully compatible with Mil-Spec lower receiver parts and triggers the BRN-180M® Lower Receiver does away with the traditional receiver extension threads and in their place has a milled in 1913 Picatinny rail section for mounting of Sig Sauer® MCX style stocks.

This Lower Receiver is made from billet 7075 T-6 aluminum with a hard-anodized finish, has integral oversized trigger guard, and the unique features of a threaded bolt catch pin and captive set screw for the takedown pin detent spring, both included.

Due to the proprietary design nature of the BRN-180M® Lower Receiver it will not function with standard AR-15 upper receivers.

Bolt catch screw, ambi-magazine release lever screw and ambi-bolt catch lever screw are all installed/removed with 1/16" allen. Take down detent capture screw = 0.050" allen. There is a tensioning screw to put pressure on the take down pin upper receiver lug = 1/8" allen

FFL Restriction:

You must be 18 years of age or older to purchase rifles and shotguns, and 21 or older to purchase handguns, receivers, frames, and suppressors. Minimum age requirements may vary by state. Check your state and local laws before ordering. It is your responsibility to fully understand the laws in your area and to ensure that possession of this item would not violate any applicable state or local laws. This product must be delivered to a Federal Firearms License holder.

See all of our AR15s and AR15 parts here.

View Product

Write a review

3 Stars

Reviews Summary

Overall, reviewers find the BRN-180M stripped lower receiver to have excellent quality and fit. However, several issues emerge, particularly regarding the absence of necessary components that affect functionality, notably the bolt catch design, which lacks full ambidextrous capabilities as marketed. Despite some users enjoying the aesthetics and intuitive controls, frustrations with functionality and missing parts are prevalent.

What Reviewers Are Saying

Product Quality

66%

The quality and aesthetics of the BRN-180M lower receiver receive praise, with reviews highlighting excellent fit and finish. Many customers find it visually appealing and well-crafted, contributing positively to their overall satisfaction.

Functionality Issues

75%

A significant number of reviewers express concerns regarding functionality, particularly the absence of a right-side bolt catch, which hinders its ambidextrous claims. This limitation is viewed as a major drawback, especially in practical use cases.

Missing Components

50%

Several customers mention frustration over missing parts, specifically the screw pin for the bolt catch. This absence renders the product unusable until a replacement can be obtained, leading to disappointment with the purchasing experience.

Ambidextrous Design

58%

Reviews reflect mixed opinions on the ambidextrous design. While some users appreciate features like the left-side mag release, they also point out that the current design does not fully realize true ambidextrous functionality, which diminishes its intended purpose.

Ease of Assembly

50%

Many users appreciate the ease of assembly associated with the receiver, noting it as a straightforward process that contributes to a positive initial experience. This aspect helps to balance out concerns about missing components.

Sort by Filter by rating

Completes my BRN180 Upper

This is a high-quality lower receiver meant to compliment the BRN180 upper. The fit and finish are excellent. Assembly was easy and quick. I am very happy with this receiver and I like the ambidextrous controls.

by Gary Runyon on November 13, 2025

Verified Purchase

Was this review helpful? 0

Awesome match for the Gen3 upper!

Other than not having the ability to lock the bolt back from the right side, I can't fine anything I don't live about this receiver. I didn't think ambi lowers were really necessary being a right handed shooter but I love the natural, intuitive position of the left-side mag release. All the holes are tight, which is good, and the stainless detent screws will be fine with a bit of added loctite.

Would you recommend this? Yes, I would recommend to a friend

by JON CRYOR on March 06, 2025

Verified Purchase

Was this review helpful? 0

It's Not Really Ambi

Seems like good quality. My biggest complaint is that Brownell's went to all the trouble of designing an 'ambi' lower and then failed to make it with a right side bolt catch/lock!?! I prefer the design of your trigger guard to the ADM but bought theirs as well to get a truly ambi lower. I also bought a Redi-Mag Redi-Catch to use with the BRN-180M lower, so at least in the event of a double feed, it will be easier to manage. All that said, I'm still waiting on some LPK parts and waiting on Brownell's to sell a .223 Wylde 10.5-12.5" upper (and a 13.9" with non P&W bbl to go with the ADM lower) before I assemble this lower. The left side mag release seems like it should work well, but obviously, I can't say until I actually put it all together.

Would you recommend this? Yes, I would recommend to a friend

by Sean King on February 04, 2025

Verified Purchase

Was this review helpful? 8

Paired with Gen2 BRN-180 Upper

For the most part I’m very happy with this lower. My only disappointment is with the right side bolt release and interference from Gen2 BRN-180 Upper Dust Cover/Ejection Port Cover (won’t be a problem with the Gen3 upper). Also I think the right hand bolt release would function easier if the supplied pin was .050” or so longer, especially with a Gen2 Upper.

Would you recommend this? Yes, I would recommend to a friend

by CURTIS O'HALLORAN on January 23, 2025

Verified Purchase

Was this review helpful? 7

Disappointing thus far

Looked good and sounded good. Came with about 7 or 8, admittedly very minor, but none the less nicks on top of the inside of the receiver. In no way should this effect functionality but is dissapointing when buying a brand new product at the higher end of the price scale! As to functionality - WOULDN'T KNOW - because the lower uses a screw style pin vs. a reg roll pin for the Bolt Catch/Release which, as per product description should be included/installed on the lower, and IT WASN'T! To make matters worse Brownells doesn't have the screw pin in stock and back order might be filled at the end of Jan, which is about 6 weeks away. Will be hunting screw pin now. Further, the Bolt Catch function is not trully Ambi. You cannot catch the bolt from the right side - only release it. Which wouldn't be much of an issue really except that on the Gen 3 Upper the charging handle is on the left now! Defeats the whole darn purpose of an Ambi lower and moving charging handle to the left because there is no way to efficiently lock the bolt back. Makes the set up real combat ineffective because you have to do an AK reach around and in essence let go of the rifle to lock back the bolt and take rifle out of ready position. Not the end of the world but is goofy and awkward considering the entire design. Have to look for a real ambi solution for the Bolt Catch/Release now!

by Paul D. on December 23, 2025

Verified Purchase

Was this review helpful? 4

Missing critical part

The receiver is beautiful. Unfortunately the bolt catch takes a screw rather than a roll pin, and it was not in the box! Makes the receiver unusable until I can get one. How long will that take?