I would like to mention that with Nerf barrel attachments, especially the long ones, do affect the performance but in the opposite way. The nerf dart will bounce around in the barrel, which slows it down. This is not a problem with this specific nerf attachment, but with all of them
Thanks for the comment, I also knew about that but I tested it with my nerf gun and this one in specific did not affect it. Although the longer ones slow it down it does slightly improve accuracy.