Board Thread:General Nerf discussion/@comment-27306930-20180925063614/@comment-24743922-20180930040359

Also, in the link I posted, it says that the Demo plunger is four times bigger, which means a bigger area to fill with air. Strong guys like us should be able to pump it, even if it takes a lot of effort because, well, the atmospheric pressure is against us. However, I am afraid that it can put too much pressure on the plastic pump, in which case being strong won't do- my muscles cannot fix plastic.

Seems like you'll have to gut the Demo plunger out and mod the whole shell and the XBZ to fit.