The Griffin MK1 rifle series represents a full featured quality value packed carbine worthy of use as your primary carbine out of the box. Front to back Griffin rifles leave no stone unturned. - The MK1 Patrol 14.5 pinned 223 Wylde carbine is a true front line fighting rifle. The tuned rifle-length gas system and suppressor optimized buffer system ensure a soft yet reliable gas system suppressed or unsuppressed. The 416R SS barrel provides exceptional accuracy and durability. We ran one of these barrels to 47000 rounds 100% suppressed while test firing suppressors with zero baffle strikes and the rifling was still present. The barrel was retired due to extension lug wear not due to barrel rifling wear. Other case studies such as multiple M24 SWS barrels holding 0.35 MOA to 20000+ rounds in army testing provides further evidence that 416R SS is an extremely durable barrel material. - Features: - Griffin 14.5 416R SS HEDP Barrel - Griffin Enhanced BCG - Griffin Forged Upper And Lower Type 3 Hardcoat Anodized - Griffin Ambidextrous Selectors - Griffin A3 Grip and Enhanced Trigger Guard - Griffin SN-ACH (Suppressor Normalized Ambi Charging Handle) - Griffin Contour Connect QD End plate - Griffin Maritime Receiver Extension - Griffin AR-SOB (Suppressor Optimized Buffer) - Griffin ECS Extreme Condition Stock - Griffin RailShield 4 Piece Panel Set - Griffin Low Pro Rail System - Griffin Primo Gas Block (pinned)