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M16 5.56 BOLT CARRIER GROUP NITRIDE MP Reviews & Ratings

The Brownells Bolt Carrier Group is made by a well-established firearms industry manufacturer, made to our specifications. All components of the BCG are made in-house, under one roof, not outsourced to the lowest bidder. Even the firing pin and gas key, commonly outsourced components, are machined by our manufacturer. These Bolt Carrier Groups are rigorously inspected at the factory, for hardness requirements, fitment, cam path geometry, magnetic particle inspection of the bolt and more. Materials for these Bolt Carrier Groups are certified in batches and the dimensions are true to the most current military specifications. Proudly Made in the USA.

Bolt is made from 9310 hardened steel, shot peened and magnetic particle inspected
Carrier is machined from 8620 hardened steel
Extractor is machined from 4340 steel and includes mil-spec extractor spring and black o-ring
Gas Key is machined from 4130 steel and attached with Grade 8 screws, that are properly staked into a milled “valley” to ensure proper positioning
Cam Pin is machined from hardened 4340 steel
Firing Pin is made from 8740 steel, center-less ground and hard chrome coated
Magnetic-particle inspected Bolt
Extractor includes spring and rubber insert
Includes torqued and staked gas key
Functions with any cartridge based on the 5.56 NATO cartridge case

The Brownells M16 5.56 Complete Bolt Carrier Group is designed to work easily and reliably in any AR-15 or M16 rifle chambered in 5.56x45mm, 300 AAC Blackout or .223 Remington. The Brownells M16 5.56 Complete Bolt Carrier Group comes with a bolt, bolt carrier, gas key, firing pin, cam pin and a firing pin retaining pin.

See all of our AR15s and AR15 parts here.

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Reviews Summary

The M16 5.56 BOLT CARRIER GROUP NITRIDE MP by Brownells garners attention for its excellent build quality, performance, and attractive price point. While the nitride finish is praised for easy cleaning and smooth operation, some reviewers noted issues with gas key staking and minor machining marks. Generally, users report high satisfaction with functionality and value.

What Reviewers Are Saying

Product Quality

75%

Reviewers frequently praise the overall quality of the M16 bolt carrier group, highlighting its sturdy construction and reliable performance during operation. Many users express satisfaction with its fit and functionality in various builds, which enhances trust in the product's durability and efficiency.

Value for Money

70%

A significant theme is the perceived value for the price point, with many reviews expressing satisfaction that the BCG outperforms expectations for a budget item. Customers appreciate the quality relative to the cost, reinforcing the BCG as a top purchase for those on a budget.

Nitride Finish

50%

The nitride coating receives commendation for its smooth surface, which makes cleaning easier compared to traditional phosphate finishes. Reviewers have noted that this coating seems to endure wear better over time, contributing positively to the overall user experience.

Customer Service & Delivery

40%

Several users commented positively on their experiences with Brownells, emphasizing good customer service and prompt delivery. Reviewers noted that their orders often arrived earlier than expected, adding to their overall satisfaction with the purchase process.

Staking and Quality Control Issues

30%

While many reviews highlight the product's reliability, some users pointed out flaws in gas key staking and minor machining defects. A few expressed disappointment that quality control did not catch these issues before leaving the factory, suggesting that some customers may need to make adjustments prior to use.

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Good Value

Good value, drop-in worked just fine. I only put about 25 round on it, and noticed no abnormal wear spots. Weirdly enough, the lugs are slightly more narrow than my Colt 6920 lugs, but less lug width variation (Colt lug 2.59mm 0.0418mm; Brownell lug 2.58mm 0.0171mm). Lug length is pretty much spot on with Colt (hence no headspace issues). I suspect this will actually help bolt longevity with more even force distribution across all the bolt lugs. Only thing I'd want is some sort of stamp, mark, or something to identify the bolt and carrier, even just a tiny "B" stamped in it. A printed MP mark only goes so far.

by Brian on August 28, 2023

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Good value, 4.5 out of 5 stars

First off, I'd have to say Brownells service has always been good, they may not always ship fast, but it is very reasonable and they always offer competitive pricing. This is my opinion so take it how you will, Toolcraft is my GO TO bargain BCG. They are proven and have great warranties. I decided to grab a brownell's BCG this time, and I do not regret it. I have not function tested this BCG, if my opinion changes I will update this review, but if it remains the same months or years from now, it is still valid and I will not edit it. So if you're wondering why the 4 star review, actually it's 4.5 if I am being nitpicking. Pros: - Looks good, coating is consistent and smooth. - Nitride coating, so easier to clean than the old phosphate ones. - Lifetime warranty from Brownells - Good price, especially because brownell often runs sales and occasionally free shipping with no minimum. Con: - this is my only con, it has more tool markings than comparable brand (toolcraft). This does not have anything to do with function, but craftsmanship reflects quality in my opinion. I do not believe this is a renamed Toolcraft BCG, but I can be wrong. The bolt has different markings. For comparison sake, I have uploaded a few images highlighting the machining that I mentioned as a con, as well as the different markings. The top BCG is a lightly used Nitride Toolcraft (greased and shows a bit of wear) and the bottom is a brand new Brownell's BCG. Overall I am very happy with the BCG I received, I am only being extra critical for review purposes, I do believe the BCG is well made, and should handle more ammo than I intend to shoot out of it. Again, Thanks Brownell's I am glad you guys are offering lots of in house brands for us at home gunsmiths, and at a bargain price.

nice quality

Nice quality and well built part. The price made it a can't pass up deal.