Spyder continues to lead the pack with this MR100 Pro military style marker. with multiple picatinny rails for endless customizing options and incredibly easy ‘field-stripability" for cleaning and maintenance on the go, the MR100 Pro is the ultimate woodsball/scenario marker. In line with our commitment to both the player and the planet, this Spyder marker also comes standard with our EKO Valve (patent pending) technology. This feature offers the best air source efficiency available in the paintball market. While reducing the cost to play and preserving the environment the Eko Valve delivers an amazing average of 1600 shots per 20 oz CO2 tank compared to the standard 800 shots from standard markers without this technology.