Board Thread:General Nerf discussion/@comment-30049823-20190906060611/@comment-30049823-20191013012758

Yup, it just ties the "decorative" extending outer shell to the bolt, so you can pull back and push forward on any part of the top or bottom side of the whole front half to prime it.

My plexiglass-piece plan is only gonna work if you want to use the most-retracted 5-6" of travel, but that big aluminum outer bar shown on the reddit thread would let you use any 5=6" of travel you might wish to use. That is, if you wanted it really pointlessly long, you'd just need longer aluminum bars.