It's a SR25 rifle also known as M110 or MK11 and complete with 4-14x44mm riflescope. Low res version has less than 10k tris for the weapon and less than 5k tris for the sight. Basic high poly mesh was made in Fusion 360 then i do retop by hand in 3ds max and start drawing textures in substance painter and finaly rendering in marmoset. Hope you'll enjoy!