I would love a shotgun similar to the style of the shotgun from Halo CE and Halo Reach, there is a reason that Bungie started Halo and ended there work on Halo with that design. The new one on Halo 5 looks abstract, but it is clunky and ugly in my opinion.the CE shotgun and the Reach Shotgun were different designs. so your statement of Bungie starting the series with the reach design is incorrect. Unless you are talking about the CE Anniversary shotgun, but CE Anniversary was made by 343.
Of course I am referring to the Halo CE anniversary one, which is not significantly different to the original, the only differences are the lack of textures/details, the squared edges and the longer barrel. But since you mentioned this, the old Halo CE model with the textures seen on the weapon in the Mega Bloks sets and on more detailed pictures, not in-game sets, pictured here
. Would be also equally awesome.