Can the NERF N-STRIKE STAMPEDE ECS use suction darts?

It is impossible to use suction or micro darts with a clip. I recommend you buy a good amount of streamline (now called clip system) darts and put away, give to a friend, or sell at a yard sale the micro or suction darts so you don't have to worry about the compatibility. If you want to buy other guns, I recommend the Longstrike CS-6. It is easily modded (you need a .2 inch drill bit that is a foot long) if you ask around on the internet.