b'ECS AND MARITIME Maritime Receiver RECEIVER EXTENSION ExtensionThe ECS (Extreme Condition Stock) is optimized for AR firearms.MSRP: $44.99Durable and aesthetically pleasing, its water evacuation ports allow for maritime operations when used in conjunction with the pictured receiver extension. Available in Black, FDE, OD Green, and Grey.MSRP: $59.95WEIGHT: 8.4oz196'