The NERF aftermarket is pretty extensive, and it’s gotten to the point where there’s even build kits for custom blasters available for purchase. One such example is this ESPER 3D printed blaster available from AKBlasterMOD. Based on a design by NERF custom part designer Captain Slug, the ESPER is a pump-action blaster that feeds from custom magazines, and fires half-darts. As previously mentioned, this is a build kit, so assembly and finish work to remove burrs is required.
www.etsy.com/listing/701689635/worker-mod-f10555-pump-action-esper-3d