KAK 9mm Enhanced Bolt, Complete, Nitride
An AR-15 9mm bolt carrier group is a piece of a firearm that houses many key parts such as the firing pin, gas key, cam pin, extractor, and bolt. With all these pieces working together the BCG can grab and feed another round out of the detachable magazine chamber. During the extraction of a cartridge, the BCG works to absorb the force of the explosion by expanding gas in the carrier. Throughout this process, gas is tapped off from the barrel and sent into the cup inside of the gas key which creates an inertial force that sends the Bolt Carrier Group back into the buffer tube. This entire process helps to reduce recoil. For 9mm bolt carriers, the bolt head is flat and is critical in creating a seal on the blow-back design of AR-15 9mm Pistol Caliber Carbines.
About this BCG: The KAK 9mm Enhanced BCG has a bolt head made out of 9310 steel and a body made out of 8620 steel. The nitride finish on this incredibly tough BCG only adds to its heat resistance and durability. This BCG comes with the ability to be fully-auto compatible and has been MPI tested to ensure that it was made properly with no structural flaws. This BCG does a great job withstanding stress and makes a perfect addition to almost any 9mm build.
Caliber Compatibility: 9mm Luger (9x19) - This BCG is designed for the 9mm caliber. The most common pistol cartridge in the United States.
Finish: Nitride - Nitriding is a process during manufacturing that diffuses nitrogen into the steel to make a case-hardened surface for improved resistance and strength. A Nitrided BCG typically has a gloss black texture. Nitrided Bolt Carriers have increased resistance from heat, and corrosion.
Material: 9310 Alloy Steel - Bolt Head - 9310 Steel is a low alloy steel that is a mixture of nickel, chromium, and molybdenum. This steel is built to have high core hardness and high fatigue strength which make it the perfect steel to hold up in the harsh environments of the bolt head.
8620 Alloy Steel - Body - 8620 Steel is a carburized alloy steel meaning carbon was added to increase the hardness of the steel. 8620 is known for its high case toughness and high core toughness. Made mostly of nickel concentrate, this steel can easily withstand the firing stress of the BCG under operation.
Gas System: Direct Blow Black - Pistol Caliber Carbine AR-15 rifles do not tap off-gas from the barrel and work in a direct blowback configuration, therefore the gas key is installed to index alongside the charging handle to allow manual operation of the platform.
Brand: KAK Industries
Caliber Compatibility: 9mm Luger
Bolt Head Material: 9310 Alloy Steel
Bolt Head Finish: Nitride
Body Material: 8620 Alloy Steel
Body Finish: Nitride
Style: Pistol Caliber
Gas System: Pistol Caliber Gas Key
Forward Assist Cuts: No
Full Auto Compatible: Yes