This replacement barrel assembly for MDR and MDRx rifles come ready to install directly out of the box. Each barrel is constructed from high strength 4150 Chromium Molybdenum, and has been given a salt bath nitride coating for a sleek black finish and superb protection against rust.

This Barrel Comes With:

• Ratchet Compensator (pre-installed)
• Adjustable gas valve
• Gas block
• Barrel extension