Introducing the all new HK Army Fossil CS3 by Planet Eclipse. The CS3 by itself is one of the most highly rated paintball guns to ever hit the field. The marker comes with the all new OP Core drive train and the first ever Fully Decoupled Drive. You will also find integrated auto dwell dynamics which give optimal reliability, consistency and efficiency. The HK Army Fossil CS3 is the most well designed spool valve assembly ever created. There is also a 50% increase in valve chamber volume which allows the OP core to operate and only 95-105 psi. This in turn, give you a reduced sound signature while also reducing the bolt force as well as recoil. This engine design combined with the higher volume chamber give you a 20% increase in efficiency over previous CS2 models of the gun. The HK Fossil CS3 also includes the new Cure FT bolt which has a higher air flow volume and a 3 stage acceleration. All of this technology gives the CS3 the advantage of having the most sophisticated drive train package to date.