Barrett's QDL Suppressor has a dual-layered tube constructed of heat-treated, high-strength alloys. This, combined with redundant 360 degree welding, makes it the safest large bore suppressor on the market. Simply sliding the suppressor over the muzzle brake directly into the indexing point guarantees proper alignment. Once in place, Barrett's unique lock-ring coupler clicks into ratchet grooves for a secure fit that nothing can shake. In fact, the entire system is designed to ensure perfect consistency with every installation in seconds. This model has an FDE finish.