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NEW!! Umbrella Corporation Gen2 Premium Bolt Carrier Group

Posted on September 3rd, 2014 by ar15news

Umbrella Corporation Weapons Research Group recently released their new Premium Bolt Carrier Group and man this thing is sweet. As I’ve explained this BCG to many people already, its basically a “No Corners Cut” BCG. Every single part of the BCG production was scrutinized to make sure this BCG is as high quality as it gets. I was able to get my hands on one and wanted to take some pictures of it and share my initial review of the UCWRG Gen 2 BCG with you guys. That way you could make an educated decision as to whether this was the right BCG for you.

Umbrella Corp WRG Premium BCG 2

Not only does it feature the awesome Umbrella logo but the fit and finish is perfect. At first glance you wouldn’t think the coating is Phosphate because its much smoother than what is required to meet Mil Spec. They also went above and beyond using the best materials possible such as the 4340 Extractor (everyone else uses 4140; both are allowed by the M4 data package but since 4140 is less costly, it always gets the nod), using Carpenter Technology No. 158 gun quality aerospace steel alloy, etc. They also proof fire each BCG, clean and inspect to make sure every one is perfect before it goes out the door. 

Umbrella Corp WRG Premium BCG 1

Umbrella Corp WRG Premium BCG 3

Aside from the quality of the BCG, there is another aspect of it…which is that it looks really awesome. Whether you have UCWRG receivers for your rifle or not, seeing the Umbrella logo through the ejection port just looks cool. Of course if you do happen to be lucky enough to have some UCWRG receivers then this BCG will really tie everything together. 

Umbrella Corp WRG Premium BCG 4

Umbrella Corp WRG Premium BCG 5

Umbrella Corp WRG Premium BCG 6

Overall, I think the UCWRG Premium Bolt Carrier Group is the perfect upgrade for someone who wants only the best in their rifle. I’m really excited to put some rounds down range with this BCG. Once I’ve had some time to get a good round count with the rifle shown below, I will come back and do another writeup to let you know about my experience with it. At this point I would definitely recommend the UCWRG BCG to anyone. Having such a detailed list of components/features (listed below) makes it easy to see why this BCG would be a no-brainer. Not to mention at the introductory price of just $165 it is not much more than the “suspect quality” BCG’s I see floating around everywhere. If you want one for yourself, they are in-stock now at

Additional Details from the UCWRG website

Umbrella Corporation AR-15 Bolt Carrier Groups are our take on a premium, no snake oil, combat ready BCG. Each and every bolt is proof fired, ultrasonically cleaned, tested via magnetic particle inspection (MPI), and once certified, parkerized for corrosion protection and lube retention. In keeping with a superior product, we don’t utilize a Crane O-Ring as a crutch to increase extractor tension. Instead, our bolts are built with a mil-spec black insert coupled with a Tactical Springs 5-coil high load extractor spring that’s compatible with all DI gas system lengths. It’s rated for 150K+ cycles to outlast your rifle barrel many times over. We have improved on the finish requirement of the TDP and have chosen the best materials of those allowed per spec, not the lowest cost like nearly all of our competitors. This second gen product is manufactured to the highest standards with an unconditional guarantee against material defect and manufacturing failure. We challenge you to compare our Bolt Carrier Group specs against the competition. Beyond using Carpenter’s 158 alloy for the bolt, ask what alloy they use for their extractors, Extractor pins, ejectors, and whether their cam pins have a solid film lube per TDP. You will likely find they don’t advertise any of these specifications.  And don’t fall for the 9310 alloy bolt substitute; it is a less expensive, inferior alloy for this application. Bought into the hype and don’t believe us? Ask Carpenter Tech; they manufacture both materials and will without hesitation tell you 158 is the proper, superior alloy. The draw for 9310 is that it’s a decent material when heat treated properly though since there’s no spec, how do you know what “proper” might be for this application? It’s less costly, and you don’t have to buy mill run quantities for manufacturing. It’s the little things that make the real difference and we cut no corners with our Bolt Carrier Groups. as before, this initial first release is offered with a discount below our suggested retail pricing. Assembly/function check by a qualified Armorer is required.


–  Bolt, precision machined from Carpenter Technology No. 158 gun quality aerospace alloy, heat treated per mil-spec (stress relieve, carburize, oil quench, temper, refrigerate, repeat temper), shot peened per ASTM B851/SAE AMS2430S, vibratory tumbled, individual high pressure/proof test fired, individual magnetic particle inspection ASTM E1444/E1444M, ultrasonically cleaned, markings deep laser engraved (SP=Shot Peened/HPT=High Pressure Tested, MPI=Magnetic Particle Inspection/158U=Car Tech 158 alloy type and Umbrella manufacture), manganese phosphate

–  Extractor, precision machined from 4340 tool steel alloy per SAE AMS6415T/AMS6484D (vs typical 4140; mil-spec allows for either 4140 or 4340), heat treat, shot peen per ASTM B851/SAE AMS2430S, markings deep laser engraved (SP=Shot Peened/4340U=alloy type & Umbrella manufacture), manganese phosphate

–  Extractor Retaining Pin, precision machined and ground S2 shock resistant tool steel alloy per ASTM A681-08 (vs typical S7; mil-spec allows S1 to S7), heat treated per ASTM A681-08, shot peened per mil-spec print, manganese phosphate

–  Extractor Spring (premium spring eliminates need for Crane O-Ring), Tactical Springs/Sprinco 5 coil, ASTM Grade A401 Chrome Silicon wire stock, heat treated, stress relieved, Molybdenum-Disulfide infused, cryogenic processed (all post winding), mil-spec black insert/synthetic elastomer extractor buffer (nitrile-butadiene, shore hardness 80+/-5 durometer per MIL-PRF-6855)

–  Ejector, S2 shock resistant tool steel alloy per ASTM A681-08 (vs typical S7; mil-spec allows S1 to S7), heat treated per ASTM A681-08, shot peened per mil-spec print, manganese phosphate

–  Ejector Spring, Tactical Springs/Sprinco ASTM Grade A401 Chrome Silicon wire stock, heat treated, stress relieved, Molybdenum-Disulfide infused, cryogenic processed (all post winding)

–  Gas Rings, mil standard stainless steel X3

–  Carrier machined from AISI 8620 aircraft qualty alloy per ASTM A108/A322-13, full auto profile, surface finish improved over mil-spec, heat treated (carburized/strain relieved per mil-spec print), hard chrome bore, precision ground gas key interface, Umbrella logo deep laser engraved, manganese phosphate

–  Gas Key machined from 4130 chromoly steel alloy per ASTM A108/A322-13, heat treated, hard chrome internal, manganese phosphate, Permatex sealed, Grade 8 Torx Plus cap screws torqued and staked all per mil-spec

–  Cam Pin—precision machined 4340 chromoly steel alloy per SAE AMS6415T/AMS6484D, heat treated/processed per mil-spec, manganese phosphate, solid film lubricant applied and cured per mil-spec

–  Firing Pin—precision machined 8640 steel alloy, heat treated/processed per mil-spec, hard chrome plate

–  Firing Pin Retaining Pin—1038 carbon steel, heat treated/processed per mil-spec, manganese phosphate

–  All components, material, and packaging made in the USA

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