Built for shooters who want maximum performance with minimum weight, the Faxon ION Series Upper Receiver combines an ultra-light profile barrel with premium Faxon components- centered around the Faxon Enhanced Forged Upper Receiver, a carbon fiber handguard, and a Faxon patented adjustable gas block for tuning across ammo types and setups. FeaturesION-Series lightweight build designed for fast handling and reduced front-end massPencil 5.56 barrel for an excellent balance of weight and capabilityFaxon Patented Adjustable Gas Block for optimized function and smoother recoil impulseCarbon Fiber Handguard for rigidity with minimal weight