Alpine Research helps their customers to build awesome suppressed AR-15s. Don't want to build your own? We've still got you covered with our awesome off the rack rifles. Our line of suppressor optimized barrels are less gas sensitive than anything on the market, making tuning much easier than with conventional barrels. Our- barrels and rifles also feature 5/8-24 threads (yes for 5.56mm) making them as stiff as possible for mounting your can.