Hi AllThis is a TAC Custom Build Systema PTW M4 CQBR, perfect working condition, only fielded once. Externals:1. 10.5 Inch Systema PTW Outter Barrel2. 9 Inch M-Lok Handguard3. Cerakote Coated Upper and Lower Reciever4. Crane style Stock5. Magpul MOE Pistol Grip6. BCM QD ASAP Plate7. Magpul Mbus Style Iron sightInternals:1. TAC Gear Box2. TAC Kumi 490 Motor (Re-winded to increase reliability)3. TAC Standard Hop4. TAC 6.03 Tight Bore Inner Barrel5. TAC Short Board (Moisture Proof)6. Piston (Instal