The Faxon Duty Series Gunner Barrel is manufactured 100% in-house from cradle-to-grave. The barrel is machined from certified 4150 steel with QPQ nitride coating for added durability and longevity. Each barrel is magnetic particle inspected (MPI) to ensure perfect surfaces and sub-surfaces as well as air-gauge tested to ensure superior accuracy. The Faxon Gunner is button rifled and perfectly designed for those looking to save weight while still allowing for the use of a suppressor long-term. Features4150 GBQ (416R) Steel ConstructionQPQ Nitride FinishM4 Barrel Extension11-degree Target CrownParticle InspectedButton Rifled