Custom animations preview:

This mod adds Jackhammer as standalone secondary shotgun. Unlock Level: 42
Weapon will appear as Crye Precision SIX12(Goliath 12G) for other players.

BeardLib is required.

Extract archive content to "mod_overrides".
How to Install Super BLT and mod_overrides mods tutorial by Master Indigo

Optional mods to use with this custom weapon:
Custom attachments for custom weapons - Adds data of custom attachments to this weapon.
FedNet-style Icons for Custom Weapons - Replaces inventory icon with Fednet style icon.