The Geissele Reliability Enhancement kit (REK) is a precision engineered upgrade for 5.56mm AR-15 rifles, designed to enhance reliability and performance. This kit includes the Geissele Reliability Enhanced bolt carrier group and the Geissele Super 42 Braided Wire buffer spring and buffer, available in H1, H2 or H3 configurations to meet specific requirements. Central to the REK is the Reliability Enhanced bolt carrier group, a full mass, full-auto rated M16/M4 component manufactured in Geissele's advanced facility in North Wales, PA. This bolt carrier group is built for durability and performance, featuring a chrome-lined, nano-coated gas key that is properly torqued and staked for optimal function. The cam pin, crafted from H13 advanced tool steel - commonly used in medical instruments - receives a Nano weapon (chrome-nitride) coating, providing exceptional resistance to corrosion and wear. The carrier's extended upper rails improve stability and feeding reliability, while the Nano weapon coating offers superior protection against corrosion, wear and abrasion. Developed in collaboration with picatinny Arsenal (US ARMY ARDEC), this exclusive coating exemplifies Geissele's dedication to innovation and quality. With a surface hardness of 82HRC, Nano weapon is harder than sand, effectively preventing carbon buildup and simplifying maintenance. This advanced coating allows the firearm to operate smoothly with minimal lubrication, ensuring consistent performance in any environment. The Geissele Reliability Enhancement kit represents the pinnacle of firearm component technology, providing a robust and reliable upgrade that withstands the most challenging conditions. Whether for professional operators or enthusiasts, the REK is the ultimate choice for enhancing the reliability and longevity of the AR-15 platform.

Automatic profile configuration
M16 profile
Carrier model 8620
C158 bolt
H13 steel cam pin
Enhanced upper rails
Chrome nitride nano weapon finish
High-order thinking (HOT) and message passing interface (MPI)
The package includes a super 42 braided spring and an H3 buffer

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