Real Action Paintball introduces the RAP4 METS (Military Enhanced Training System), a paintball marker that is identical to the M-4 rifle used by SWAT teams. This marker is designed to replicate the look, feel and action of the real M-4. It has features that mimic the M-4, such as shell ejection after every shot, magazine fed paintball rounds, and the option of a collapsible or solid stock housing. The RAP4 METS shoots .43 caliber paintballs that are loaded into alloy or biodegradable plastic shells. The RAP4 METS line has improved accuracy, range and overall precision of the marker, as well as the added realism of real-world functionality.