The Geissele Reliability Enhanced Bolt Carrier And Gas Key is a full-mass, full-auto rated M16/M4 5.56mm carrier group component engineered for shooters who demand consistent function from their AR-15 platform. Precision machined in Geissele’s state-of-the-art facility, this carrier features extended upper rails that promote smoother cycling and more stable feeding, while the Nanoweapon-coated exterior and chrome-lined, Nanoweapon-coated gas key are designed to stand up to hard use and high round counts.

This bolt carrier and gas key assembly is ideal for upgrading an existing 5.56 rifle or completing a premium build focused on reliability and ease of maintenance. The slick Nanoweapon surface helps resist fouling and simplifies cleaning, making it well suited for high-volume range sessions, training, and suppressed use where carbon buildup is common. High-pressure testing and magnetic particle inspection underscore Geissele’s focus on quality control and long-term durability.

Key Features:

• Manufacturer: Geissele
• Model: Reliability Enhanced Bolt Carrier And Gas Key
• Caliber: 5.56mm
• Type: Bolt Carrier
• Finish Color: Black
• Unique Features: Nanoweapon-Coated Carrier, Chrome-Lined Nanoweapon-Coated Gas Key, Extended Upper Rails, High-Pressure Tested, Mag-Particle Inspected