Measured with Umarex 0,35 g steel BB ( without silencer + with silencer ) & ASG Blaster 0,13 g plastic BB ( without silencer + with silencer ) & fresh 2 x CO2 cartridges.Approx 100 shots with two co2 cartridges.Weight : 2857 g.Distance 6 m.The silencer contains a barrel extension.Power after unpacking from the box was higher : without silencer +, 126 m/s , with silencer : + 137 m/s ,then dropped ! After a week and lubrication, the values settled at : + 124 m/s ( no silencer ) , + 140 m/s ( silencer ).