The 51P pistol features a classic style polymer handguard with an 8.5" bull barrel. The precision-welded top rail allows the addition of your favorite optic or use the traditional iron sights (included). The end cap is compatible with M4 buffer tubes or the included swivel end adapter.FeaturesClassic style polymer handguard8.5" Bull barrel7.5" top rail for quick optic mountingM4 buffer tube compatible end cap with swivel end adapterPaddle style magazine release