The RDB is the new definition of bullpup. Its downward shell ejection system eliminates the side ejection disadvantage of ordinary bullpups. The result is brass and gas that eject out of your line of sight making it a truly ambidextrous, high performance rifle for everyone. The RDB also makes for an excellent suppressor host. It's definitely the bullpup done right. Features1:7" twist1/2x28 threads1913 Mil-Spec Picatinny rail4 pound trigger pullAmbidextrous magazine releaseAdjustable gas systemDownward ejection port20 round magazine capacity (or any AR-15 compatible magazine)