Looking good! Looking forward to a smaller version. 12 inches for a pistol is too big for me. Also why not put the plunger/s in the handles (yes 2 if needed)? By making the plunger rectangular like the pocket strike.
This is the smallest it can go. Slug has been working hard on getting in pistol size, but the energy required to shoot nerf darts is actually quite high and thus requires a large plunger tube. It has to be even bigger considering it is not directly flowing and thus has some minor velocity loss. The whole point of this pistol was to make it mag fed through the handle so a jolt style blaster would not work + it would be jolt performance not nic-grade like the goal of this project was.