This is a paid asset, but now you can download Gun Store and Shooting Range for FREE, but please remember this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Gun Store and Shooting Range v1.0
This Gun store comes complete with a store section which houses the weapons as well as a 7 lane shooting range.
High detailed models of the following weapons come as part of the package. These weapons have been added as separated components incase you want to animate:
MP5 Shotgun MP5 AK74U MX25
The Interior and Exterior mesh have been split up so you can use as you wish as well as an assortment of props and signage.
All materials have been set up using a PBR work flow and texture have been included along with normal maps and lighting.