>>6337446Just in terms of function rather than ergonomics consider the following (because the only blaster large enough for what you're asking is the shit centurion)
Air pressure powered blaster like the buzzbee xtreme blastzooka with a brass breach (or just rebarreled) that won't kill anyone if it's singled.
Alternatively pic related.
Maybe make your own springer out of pvc? No one makes large single shot frontloaders anymore.
