Board Thread:General Nerf discussion/@comment-27125665-20191221233705/@comment-30049823-20191223020732

You're unlikely to have any problems with Nerf HIR, Adventure Force (orange), or X-Shot Chaos (red) rounds; they have different surface textures but nearly identical dimensions.

The fashion-colored ones manufactured by a no-name brand and gray-market imported are the problematic small ones. They work well enough with flywheels, but you may get a less-pronounced backspin/hop-up effect from them.