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078-000-405WB
M16 Lightweight Bolt Carrier Group 5.56x45mm Nickel Boron
Cartridge: 5.56 mm NATO
Finish: Nickel-Boron

Designed for Lightweight, Low-Recoil Rifles
The Brownells M16 Lightweight Bolt Carrier Group is purpose-built for AR-15 owners looking to improve aspects of their rifle with a simple component swap, eliminating the need for major component replacement or amateur gunsmithing work.

The Brownells M16 Lightweight Bolt Carrier Group is machined from 8620 tool steel and features a heavy-duty bolt made using 9310 tool steel, which is then magnetic-particle inspected to ensure quality. The bolt is light enough to reduce the overall weight of a lightweight AR build, and the lightness of the entire assembly also reduces the felt recoil of any AR-style firearm.

- Available with nickel-boron, titanium-nitride or nitride finishes
- Weighs 8.2 ounces
- Compatible with AR-15s chambered in 5.56 NATO, .223 Rem., 300 Blackout and .204 Ruger

The Brownells M16 Lightweight Bolt Carrier Group ships completely assembled and features the necessary black insert and O-ring around the extractor, as well as a torqued and staked gas key.

SKU#: CRC556LW010

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Compare prices for CRC556LW010 - Brownells M16 5.56 Lightweight Bolt Carrier Group - M16 Lightweight Bolt Carrier Group Nickel Boron 050806112445 from all vendors

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$129.99
$7.00

Comments (10)

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Scroll down for the nitride which is a little less.

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Anyone ever receive the gift card after ordering?

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I'm only getting 10$ off the 139.99$ using code NAP, what am I doing wrong ?

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Sorry, the sale has expired, they're back up to the regular price of 139.99

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Finally, a lightweight bcg made of steel for a reasonable price -- that retains the forward assist serrations.
I'm going to wait for availability of the nitride version, as well as a few reliability reviews.

1 vote
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In for one.

I have done lots of thinking and research on a lightweight set up, and have always shied away due to murmurings of decreased reliability.

However, after more thinking and reading (due to this deal), I believe it likely that one could obtain the same level of reliability with tuning, and slightly over gassing the system.

I will start with an adjustable gas block, and then look at adjusting springs and buffers if I am not satisfied with that.

I love the idea of a lighter weapon, and especially one that recoils less, enabling more accurate and faster shots in quick succession (ie double/triple taps).

If it goes well with 5.56, I will try the same carrier and procedure on my new Grendel build.

Either way, I will attempt to remember to update with my findings here.

4 votes
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Man I always get adjustable gas block first. Period. Then get a lightweight BCG, standard spring, and carbine buffer. Turn the gas off and then back out until it locks back. The another turn 1/4 and lock into place.

3 votes
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I've built a handful of lightweight builds using LW BCGs and SLR gas blocks (built on Ballistic Advantage and Faxon barrels--from 10.5" up to 16"--both carbine and mid gas pencil profiles).

As long as you've got enough gas to start, getting it tuned with the Adj. block is quick. I've had no issues with reliability, setting up to run from cheap wolf steel (lowest pressure) to hotter 62gr, 68gr, and 75gr loads.

AIM and RTB lightweight carriers, mostly SLR adjustable blocks, with one Superlative as well.

Good luck and enjoy your builds.

3 votes
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Anyone used these ? Need new springs I assume?

1 vote
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I believe these are a fairly new offering from Brownells so there aren't really any longevity write ups that I'm aware of. I have not tried it yet but ordered 1 for a new build. Will be paired with the JP SCS and SLR AGB.

People have posted elsewhere saying they dropped it into their current setup without changing anything else and didn't have any issues. With that said, I think an adjustable gas system is required more than a spring change (initially) to really see the benefit of a lightweight bcg. If after adjusting the gas there are issues with bolt bounce, failing to go into battery etc, then a spring and/or buffer change should be considered. Time will tell of its quality, for $105 I figured why not.

It appears to be the same lightweight cut as the ones provided by cryptic coatings but without their fancy finishes or price tag, 8.2oz makes it one of the lightest BCGs without having to move to titanium or aluminum and at a bargain price

1 vote
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