Meet the Architects

The tweet that started it all for me

Predecssor

Halo: Reach’s M319 Grenade Launcher

Bungie’s last game before Destiny 1 was Halo Reach and it included a break action, breech-loading grenade launcher very similar to Fighting Lion. If Halo’s Rocket Launcher was the newb tube, then the Grenade Launcher was the Pro Pipe.

Side View First Person View Display
The Halo Reach Pro Pipe

Read more on the Halo Wiki.