Premium Bolt Carrier Group Gen 3

Description

As with previous generations, Umbrella Corporation AR-15 Bolt Carrier Groups are our take on a premium, no snake oil, combat ready BCG. Each 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 many of our competitors. This third gen product is manufactured to the same high standards with an unconditional guarantee against material defects and manufacturing failure. We used to challenge customers to compare our Bolt Carrier Group specs against the competition, because back then, no manufacturer offered the extensive details that we did, likely because most had no idea what the specs actually were without access to the technical data package. It shouldn’t have been a surprise to find our product specifications lifted word for word right from our website by well-known competitors, but that’s exactly what happened. Flattering? Sure, but obviously bad for consumers who were being tricked and misled by companies they trusted. These days, AR providers post material specs sourced from the internet and each other, still without having access to the M4 TDP. Or maybe they get the details from the contract BCG manufacturers they buy from, though nondisclosures typically prevent that. Regardless, as we’ve always done, we post our very detailed specs, so you know exactly what you’re getting. And don’t fall for the 9310 alloy bolt substitute; it’s 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. We’ve updated our USA made TorxPlus carrier key screws with the splines and knurling of Ned Christiansen’s (Michiguns) excellent OCKS (Optimized Carrier Key Screws) process. Assembly/function check by a qualified Armorer is recommended.

Additional information