GunOS 4.5 update

We had GunOS 1.0, 4.1, all that stuff, but here we have pure innovation. Enter GunOS 4.5. See all-new sound effects, warning effects etc. With the GunOS 4.5 update, carry your gun's power to the extreme, with it's new BulletRefinePro+. (DISCLAIMER: The GunOS 4.5 update is only available for 2014 editions and up, excluding CircleBarrel and CircleBarrel+ editions, up to "The Big Refine" models AKA 2016 editions, also excluding 2020 models.)