Windham Weaponry R16M4FTT: Windham Weaponry\'s SRC (Sight Ready Carbine) features a chrome-lined 16\" 4150 chrome moly vanadium steel barrel with M4 feed ramps. The 7075 T6 aircraft aluminum receiver sports a durable black hardcoat anodized finish. The rifle features an aluminum trigger guard, M4 double heat shield handguards and is optic ready. This rifle is available with Magpul MOE furniture in multiple finishes.