The Radical Firearms 5.56x45mm Semi-Automatic AR-15 Rifle RF10656 features a 16" barrel and a 15" RPR Handguard, paired with Flat Dark Earth B5 furniture. This rifle utilizes MIL-STD upper and lower receivers and includes a 15" RPR free float rail system, which enhances accuracy, keeps your hands cool, and provides ample space for accessories. This model is upgraded with a Flat Dark Earth B5 pistol grip and stock.