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Questions & Answers
Hello. Do these cime properly stacked? Thanks. Expert Answer

Yes, the Jacob Grey Firearms Ultralight 5.56 Nato High Polished PVD Bolt Carrier Group come completely assembled and properly staked/sealed. The BCG also features a lifetime warranty.

by Ethan, Gear Expert, May 8, 2023
Customer Reviews
Helpful Negative Review
BCG looked nice from a distance by Aaron, Verified Owner, October 12, 2023
Has machining marks and a funny finish. Big problem is the staking and the bolts. Bolt heads rounded and poor staking/ cracked out. Very poor quality control- disappointed. Can i please post pictures....whats going on JG??? Not usable as shipped.
15/15 found this helpful
Most Recent Reviews
multiple failures by Southern Bullfrog, Verified Owner, September 7, 2024
I had this in one of my rifles and it wouldn't make it thru a mag without jamming. I tried different ammo and mags and same thing would happen 2 rounds would get stuck. So i swapped a standard psa bcg and now i have no issue. I definitely regret this...
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1/1 found this helpful
Most Recent Reviews
Designed well but QC is an issue by Alex, Verified Owner, March 23, 2024
Purchased two of these BCGs. As someone stated in prior reviews the gas key bolts are not properly staked. Used on one of my .300 blackout Aero builds and the gas key blew up and pieces of if got jammed in upper receiver. Noticed that 2nd BCG I have ...
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1/1 found this helpful
Most Recent Reviews
High price doesn't mean high quality by Sturmenater, January 27, 2024
Do your self a favor and avoid this bcg not staked at all
8/8 found this helpful
Most Recent Reviews
I have ordered a few of these in black. The coating is comparable to Cryptic -- very slick, super easy to clean. Price cannot be beat for a low-mass, PVD coated, HP tested, lifetime warranty bcg. I did get one bad one -- horribly staked, some tool...
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Read All 5 Reviews

Product Discontinued by Manufacturer

Jacob Grey Firearms Ultralight 5.56 Nato High Polished PVD Bolt Carrier Group (BCG)s has been discontinued by Jacob Grey Firearms and is no longer available. Our product experts have helped us select these available replacements below.You can also explore other items in the Gun Parts, AR 15 Parts, Rifle Parts, AR15 Upper Parts, Bolt Carrier Groups yourself to try and find the perfect replacement for you!

Product Info for Jacob Grey Firearms Ultralight 5.56 Nato High Polished PVD Bolt Carrier Group (BCG)s

Jacob Grey Firearms DLC (Diamond-Like Carbon) coatings have been widely successful in the aerospace industry. Jacob Greys carbon-based coating has extreme hardness due to the diamond crystal structure and is soft and lubricious due to the graphite crystal structure. Our DLC coatings are generally amorphous (without typical crystal structure). The properties of DLC coatings in terms of increased hardness, coefficient of friction, roughness, adhesion level, load carrying capacity, resistance to humidity influenced degradation, fatigue tolerance, etc. can easily be explained as beneficial within the firearms industry. But with its sleek and stylish looks and its ability to withstand carbon buildup and fouling, why would you want anything less inside your firearm. Available in Jacob Greys signature DLC black color Lethal Black.image

Why DLC on your BCG:

First off, the surface is very hard and smooth making it an extremely high wear resistance coating. The friction coefficient is greatly reduced requiring less lubrication. Operating temperatures are lowered. Yes, you can run without lubrication when its necessary but its good practice to use a small amount of oil whenever allowable.

Features of Jacob Grey Firearms Ultralight 5.56 Nato High Polished PVD Bolt Carrier Groups:

  • HP proof testing, 100% using a high pressure M197 or SAAMI commercial equivalent;
  • MPI testing after above, 100% inspection per ASTM E1444 using a standard 5 turn magnetizing coil;
  • Bolt Carrier Style: M16 Full Auto;
  • Mil-Spec Ejector Springs, Firing Pin, Retaining Pin, Gas Rings, O-Ring;
  • Mil-Spec Heat Treated;
  • Lifetime warranty

Package Contents:

  • Jacob Grey Firearms Ultralight 5.56 Nato High Polished PVD Bolt Carrier Groups

Gun Triggers

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Gunsmithing Tools & Accessories

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Magazine and Accessories

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Gun Parts and Accessories

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Gun Barrels

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Gun Sights

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Gun Stocks

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Mounts, Rings and Accessories

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Related Products to Jacob Grey Firearms Ultralight 5.56 Nato High Polished PVD Bolt Carrier Group (BCG)s

Jacob Grey Firearms Ultralight 5.56 Nato High Polished PVD Bolt Carrier Group (BCG)s Unavailable & Discontinued Models

List of Unorderable Models

  • Jacob Grey Firearms Ultralight 5.56 Nato High Polished PVD Bolt Carrier Group BCGs, Black, 556ULBCGBLK , MPN: 556ULBCGBLK , UPC: 850040696493 , Code: 4M6-BCG-JCUNPB-556ULBCGBLK
  • Jacob Grey Firearms Ultralight 5.56 Nato High Polished PVD Bolt Carrier Group BCGs, Rose Gold, 556ULBCGRG , MPN: 556ULBCGRG , UPC: 850040696486 , Code: 4M6-BCG-JCUNPB-556ULBCGRG
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