The Kel-Tec Sub-2000 is a semi-automatic rifle chambered in 5.56MM. It accepts most popular AR magazines while a 16 barrel is adorned with a hinged ghost ring rear sight and a removable windage and elevation adjustable post front sight. The Sub-2000 rifle folds down to a 16.25 by 7 area. Details With 11 game-changing innovations the RDB is the new definition of bullpup. Its downward shell ejection system eliminates the side ejection disadvantage of ordinary bullpups. The result is casings that eject out of your line of sight and a truly ambidextrous high performance rifle. The RDB is also adjustable for a wide variety of ammunition. Its definitely the bullpup done right. - Caliber .223Rem - Weight Unloaded 7.1lbs (20) - Magazine Capacity 20 or any AR15 compatible magazine - Overall Length 30.6 - Barrel Length 20 - Twist Rate 17 - Trigger Pull 4lbs