Gorilla Machining AR-15 .300 Black Out / 5.56 / .223 Wylde / .350 legend Bolt Carrier Group Mag Phosphate Chrome lined

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Your Price: $79.99

Retail Price:$210.00

Your Savings:$130.01(62%)

AR-15 .300 Black Out / 5.56 / .223 Wylde / .350 legend Bolt Carrier Group Mag Phosphate Chrome lined

Part Number: GM-BCG-5.56-1

Availability: In Stock

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Customer Reviews

Gorilla Machining Has the perfect AR-15 .223/5.56 bolt carrier group for your next AR-15 rifle build. This product is a high-quality BCG. Installing this on your rifle will assist and help take your customized rifle to the next level. Machined from 8620 steel, the Gorilla Machining mil-spec bolt carrier group is heat-treated with a Manganese Phosphate with hard chrome lining finish so there’s lower friction that minimizes the need for lubricants and cleaning. The heat treatment is to military specifications and tolerances. Because it has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength, the Bolt, Gas Key, and Extractor are all manufactured from 4140 steel.

Brand GORILLA MACHINING
Caliber .223 Wylde / 5.56 / 300 Black Out / 350 legend
M16 Carrier Style Standard
Bolt Finish Mag Phosphate
Bolt Material 9310 Steel 
Carrier Finish Mag Phosphate
Chrome lined carrier
Chrome lined Gas key
Gas Key Staked 
Magnetic Particle Inspection Yes

*NOTE: BARRELS & BOLTS MUST BE PROPERLY CHECKED FOR HEADSPACE PRIOR TO USE. FAILURE TO DO SO MAY RESULT IN DAMAGE, PERSONAL INJURY, OR DEATH*

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4.9

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Best bcg I’ve ever used

Iv used colt, fn and bcm bolt carriers for most of my life and I can say that the gorilla machining bcg is on par if not better than them in terms of fit and finish and in terms of price it’s even better. I will be using gorilla bcg’a from here on out and I couldn’t be happier. Bcg came immaculate and ready for some serous use.

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Reviewed by: Jorge Rosas from Texas on 11/25/2019

Great Quality even Better Price

I try to pickup a few bcg’s from time to time for my AR inventory. Most of my builds have top shelf BCG’s with all the popular coatings, so I know good quality. These are machined well and function flawlessly at the range. Don’t think because they are ‘value part’ the quality isn’t tiptot. You won’t be disappointed.

Did you find this helpful? 9 of 9 Found Helpful

Reviewed by: (Verified Buyer) Scotty from Sikeston on 12/14/2019

Very nice BCG

Very good quality and a price that can't be beat. This BCG looks identical to the one that came in my Stag. I only got a couple hundred rounds though it but I have had no issues.

Did you find this helpful? 7 of 7 Found Helpful

Reviewed by: John Henry from Mocksville on 12/18/2019

Manufacturer of Custom AR Rifles

Excellent product. $$$ Less than others for same if not better quality. I've been using GM for years as an individual and now I use them weekly with my new Business. Excellent products with awesome customer service. It doesn't get any better than Gorilla for quality parts/builds. Highly recommend!!!

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Reviewed by: Chris@AOP from Wyoming on 12/22/2019

Good quality

These aren’t low end bolt carrier groups. The two I received were chrome lined on the inside. The bolts were stamped mpi. I’ve seen less quality from higher end hyped up brands. The machining and finish on them looks great. I’ve used these in several of my builds and have had zero issues. For the price, I highly recommend them.

Did you find this helpful? 5 of 5 Found Helpful

Reviewed by: Weston from Oklahoma on 1/22/2020

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Gorilla Machining AR-15 .300 Black Out / 5.56 / .223 Wylde / .350 legend Bolt Carrier Group Mag Phosphate Chrome lined

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