"Building on the success of the LE6920 used by law enforcement and security forces around the world, the Colt LE6920-FBP2 M4 Semi-Auto Rifle features a number of upgrades that take performance to a new level. It comes from the factory with a Geissele Mk4 13.5"" free-floating M-LOK handguard that provides enhanced rigidity. Additionally, the original stock has been replaced by a streamlined Magpul CTR 6-positions stock that prevents snagging and accidental length-of-pull adjustments. The FBP2 also comes equipped with Magpul Pro back-up iron sights, so it's ready for action right out of the box. Other features include a 16.1"" free-floating barrel, ambidextrous charging handle, and mil-spec trigger. Upgraded version of the proven LE6920 Geissele Mk4 13.5"" free-floating M-LOK handguard Magpul CTR 6-position stock Magpul Pro back-up iron sights 16.1"" free-floating Cr-Mo-V barrel with A2 flash hider Ambidextrous charging handle Mil-spec trigger"