A One Handed Sawn-Off Shotgun

[Trianite]

I want to make a mod which means that when you equip the sawn-off grip on the double barrel shotgun, it converts the weapon type to a pistol but still shoots the 12 Gauge rounds and has the same animations, similarly to how plasma weapons work (equipping a pistol grip makes them one handed but equipping a rifle stock makes them 2 handed)

 

I attempted to recreate this in AMAW without any success and would like some guidance from the community on exactly how i would do this in CK. I've seen people say that you could use the flare-gun as a base for it but im not sure on how im would be grafting the meshes, textures and animations of the shotgun onto it and writing the script which automatically changes the holding animations when the modification is equipped