Double recon shotgun

slapdash remixed from
JackRabbitNerfer's remix of ehdrien's magnus pump grip - https://www.thingiverse.com/thing:2912724
gdop26's spring thunder pump grip - https://www.thingiverse.com/thing:2846629/files
Zero-Blade's grip and double prime piece - https://www.thingiverse.com/thing:2981138/files

for use with
retaliator shotgun adapter - https://www.thingiverse.com/thing:3053220
barrel brackets - https://www.thingiverse.com/thing:2590061/files
trigger and locking mechanism - https://www