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M16 Nickel Boron NiB BCG Full Auto Bolt Carrier Group Assembly
On Sale
M16 Nickel Boron NiB BCG Full Auto Bolt Carrier Group Assembly

M16 Nickel Boron NiB BCG Full Auto Bolt Carrier Group Assembly

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US Made m16 full auto bolt carrier group with NiB coating

Article code:
In stock
Delivery time:
This product should ship within 1 to 3 business days.

Product description

This precision machined and superior quality Full Auto bolt carrier group utilizes an 8620 steel for the carrier and a 9310 bolt that are both then Nickel Boron coated before being assembled. Extractor has a Crane O-ring installed for reliable brass extraction. No Garbage MIM parts are used, this is fully machined.

Made in the USA


John Heger
28-06-2022 14:31
It is pretty but seems too tight, maybe mine is a fluke. Won't cycle right. Mil-spec bolt carrier group would cycle anything I put in it with H2 buffer but even dropping back to carbine buffer this will only reliability cycle 62 grain and up in my 10.5 in build. I've put maybe 200 rounds through it so far. Maybe it will wear in and cycle more reliably after another couple hundred rounds. Definitely easier to clean.
Chad W.
10-03-2022 04:09
Bought 07/23/2020 and am reviewing now on 03/09/2022. Have run around 5000 rounds of whatever ammo I found at a reasonable price including lacquered steel case garbage and this BCG has run flawlessly. Very easy to clean and showing no wear except a slight heat discoloration which from looking at my other NiB BCGs seems normal. Very Highly Recommended!
Eric werick
27-08-2021 18:37
Purchased 6- 14- 2020 for 99.00/ 108.oo shipped she is a butte and strong like bull love the extras .
11-02-2021 19:55
Ordered 5. Fast shipping, good product overall. Thanks
28-06-2020 15:15
Received BCG in 3 days in secure package. Also included were Firearms Unknown Extras.. Also, I would like to thank all the guys who helped this old man on the phone navigate the web page to place the order. This was my first but it won't be my last. Great job.
Larry Benton
26-06-2020 23:02
Received BCG in 3 days in very secure package. Excellent. Extras in the box. Thanks. But first let me, "Thank You" for helping this old man navigate your web page to place the order. You guys are great. My first order but not my last. Have bookmarked Firearms Unknown.
Geary D Formby
20-03-2020 21:24
Everything I've purchased from these guys is 1. Priced right, 2. Top quality, 3. Shipped out fast, 4. Well packaged and finally, 5. No Chinese Bats were harmed or eaten in our transaction.
07-02-2020 02:53
3,000+ rounds through my rifle with this BCG. Flawless thus far.
Doug B
05-01-2020 14:14
This is the second N.B. BCG that I've purchased from these guys. It functions great, super slick and looks great. They sent me an appreciation gift, a steel safety ambi adaptor. With treatment like this, customer for life! Thanks Firearms Unknown. Doug
27-12-2019 02:36
Real nice bcg low price finish is nice and slick no tool Mark's fast shipper
Brian Goulet
08-12-2019 01:13
Looks great and was here in 3 days. They even threw in some free goodies. Above and beyond my expectations.
09-07-2019 06:54
I dont trust this / is it a blem product or something? I've never heard of this company before.

*Response from Firearms Unknown* While we understand that you have never done business with us before, we would like the opportunity to change your mind. This is not a blem product, it is brand new straight from the factory and has passed QC measures at a AS9100 and ISO 9001 certified shop.
08-07-2019 19:37
This is a very nice BCG. Staked well with an even finish. Super fast shipping. Will be buying more.
27-06-2019 01:17
Shipping was fast. Got it three days after I ordered it. Thanks.
26-06-2019 22:07
Got one because of the price. Looks much better in person than the photos on the site. I’ve seen better looking NiB coatings from places like FZ, but those are 200+ dollars.

I will be buying more of these.
Thomas Christian
25-06-2019 23:36
Got 5 of these.
Finish is great. Staking looks proper. Overall great buy.
4.7 stars based on 16 reviews

Product specifications

Bolt: 9310, Shot Peened, Heat Treated, Nickel Boron Plated
Carrier: SAE 8620, Heat Treated, Nickel Boron Plated, Full Auto
Extractor: Swiss Machined, Heat Treated, Precision Ground, Nickel Boron Plated
Firing Pin: Swiss Machined, Heat Treated, Precision Ground
Gas Key: CNC Machined, Heat Treated, Chrome Lined, Torqued and Staked to Mil-Spec, Nickel Boron Plated
Cam Pin: Swiss Machined, Heat Treated, Nickel Boron Plated
MPI Tested: Yes, Lot Tested
Country Of Manufacture: United States

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