Nerf Monoblast Replacement Barrel

I noticed one of my vintage Nerf Monoblasts was not firing at all. I took this opportunity to design a replacement barrel. It has multiple functions. It allows you to install a 17/32 brass barrel. The big end not only acts as the plunger stop but when inserted in far enough blocks off the air hole for the original barrel. This does come at the cost of slightly reduced plunger tube volume, but gives you more room for your fingers to prime. Still has excellent performance for the size. Part needs to be glued in.