The Geissele REBCG was developed to provide enhanced reliability over the standard M16/M4 Military Rifle, 5.56mm FMJ, A3-A4 type rifle bolt carrier group for both semi-automatic and full-auto applications in the most demanding combat environments. The Geissele Reliability Enhanced Bolt Carrier Group (REBCG) is a new design in AR15/M4 bolt carrier groups.
Geissele says that this design has been improved in terms of reliability and performance. In addition, the REBCG uses a new coating process that helps reduce friction and wear. Geissele REBCG features a number of enhancements, including an improved firing pin, lighter bolt, and improved extractor design. According to Geissele, these improvements result in a greater percentage of reliability when compared to standard bolt carriers.
The Geissele Reliability Enhancement Bolt Carrier Group is available in both M-LOK and KeyMod variants and can be installed on any AR15 platform. A bolt carrier group, also known as a BCG, is the part of an AR-15 rifle that holds the firing pin and rotates with the barrel to chamber a round. A reliable BCG is essential to ensuring a consistent and safe firing experience.
Geissele's Reliability Enhanced Bolt Carrier Group (REBCG) was designed with this in mind. The REBCG features machining and heat treatment processes that increase the material's strength and durability. This leads to a longer barrel life and increased accuracy.