Coated Bolt Carrier Group BCG (full auto version) for AR15, M16, or M4 machined from Mil-Spec 8620 aircraft quality steel with shrouded firing pin and Mil-Spec chrome lined interior. BCG includes the proper chrome lined and heat treated gas key. Gas key is secured to carrier with Grade 8 fasteners and properly staked per Mil-Specs. This ensures a strong staking and proper gas system functioning. The bolt assembly is CNC machined from Mil-Spec Carpenter No. 158 steel and shot peened for increased strength per Mil-Spec. HPT (High Pressure Batch Tested) and MPI (Magnetic Particle Inspected). Specifications for Cryptic 6.8mm SPC/.224 Valkyrie/.338 Spectre Bolt Carrier Group (BCG) – Complete: Manufacturer: Cryptic Fabric/Material: Carpenter 158 Steel, 8620 Aircraft Quality Steel Cartridge: .338 Spectre, .224 Valkyrie, 6.8mm Remington SPC Gun Make: AR Platform Gun Model: M16, M4, AR-15 Hand: Ambidextrous Included Accessories: Standard Weight: 11.55 oz Bolt Material: Steel Carrier Material: 8620 Steel Features of Cryptic 6.8mm SPC/.224 Valkyrie/.338 Spectre Bolt Carrier Group BCG – Complete Reduced Carbon Fouling; Easier Cleaning; Full Auto Carrier (Backward compatible with all semi-auto rifles) Package Contents: Cryptic 6.8mm SPC/.224 Valkyrie/.338 Spectre Bolt Carrier Group – Complete Gas Key Key Staked with Grade 8 Screws Bolt w/ Spring and Ejector Extractor w/ Spring and viton O-ring Firing Pin Cam Pin
cowflaps –
Yes. It’s a beautiful BCG, with a perfect finish and flawless functionality. Headspace was perfect with my ARP 14.5 barrel and with the smaller bolt rim size I wanted to have something that I could have 100% confidence in.This particular finish looks like a deep chrome finish and the logo is almost a shadow effect.This is my forever hog gun and I built it to last generations. I feel like this Cryptic BCG was the best I could hope for, and it’s not even that pricey!
cowflaps –
This is as much a piece of art as much as it is the heart of my 6.8 SPC hog gun.The fit and obviously the finish is beyond most all other BCGs, and the quality of the carrier steel (aircraft quality 8620 treated to 60-61 Rockwell) and bolt (Carpenter 158) is certainly worth the few extra bucks. MPI inspected and HP batch tested. The finish is so smooth and deep, it almost looks like a powder coat as opposed to chrome, but that’s only because Cryptic is so good at what they do.The case size of the 6.8 being around .420”requires a thinner bolt face than the standard bolt fact, so the peace of mind and potentially added reliability means something when a couple hundred pounds of angry razor toothed meat decides they don’t like you. The idea that the rifle might go “click” instead of “bang” doesn’t enter my mind when I pick up this rifle. This bolt headspaced perfectly with my 14.5 ARP and rides slick in the WMD upper.This is my first Cryptic but it won’t be my last. If you can find one on sale, I recommend becoming a customer of Cryptic. Made in the USA and based in Denver, these guys stand behind their products with a Lifetime Warranty.That means you only have to buy ONE. After your barrel choice, the next is BCG. You will love this one.
Mike –
The Treated Versions of the Cryptic BCGs are excellent BCGs. The BCG has a coating on it that helps keep it clean and facilities the movement of the BCG in the firing cycle. Brass consistently ejects at the 3:00 to 4:00 position. The coated versions of the Cryptic BCGs aren't cheap, but IMO they're worth it.