From their website: http://www.troydefense.com/firearmsa...-5-56-carbine/

Troy Defense 5.56 Carbine Specifications:
-Mil-Spec forged flat top upper receiver with integrated M4 feed ramps (FDE Rifles are Ceracoated & Hard Coat Anodized)
-Mil-Spec forged lower receiver with Troy Industries Enhanced Trigger Guard (FDE Rifles are Ceracoated & Hard Coat Anodized)
-Chrome Moly Vanadium Melonite coated 1/7 RH twist barrel, chambered in 5.56 with M4 feed ramps
-Troy Industries free float modular 13″ Alpha Rail system with integrated spring loaded front M4 Battlesight
-Mp tested mil-spec bolt and carrier with upgraded extractor and properly staked gas key
-Troy Industries Battle Ax 6 postion (Pinned for compliant models) buttstock with Mil-Spec receiver extension
-Troy Industries Medieval Flash Suppressor/or pinned Claymore Muzzle Brake
-Troy Industries Rear Folding Battlesight
-Troy Industries Enhanced CQB Pistol Grip
-Troy Industries 10 round Battlemag