This is a shell for the Nerf Sledgefire. It will allow for breech loading of the gun and will fire at roughly the same velocity of stock darts. It will most likely work only with modified guns due to the air restrictors possibly causing problems. I reccomend removing air restrictors for better consistency in firing. The fit is much better with new darts (I will updated a slightly tighter version for worn darts after testing). Single shot and Mega Dart versions will be coming soon, as well as a shell designed for a CPVC barrel for better accuracy. Please let me know if you have any other ideas for derivatives and feel free to post yours here, I'd be happy to see them.