The M84A2 is the second revision of Canis's M84 rifle, which itself is an update of their M64 rifle. The main upgrades between the first and second revisions are the minimal-style pistol grip, the ability to swap out the muzzle brake for a different muzzle attachment. and the open usability of different scopes with the Quick-Detach system of sights. While this weapon has since been upgraded from the 80's to the M84A3 and M84A4, many modern shooters still flock to this model for the unique look and sighting system.
M84A2 (c) Mayor-Luv

https://www.deviantart.com/mayor-luv/art/M84A2-874081110