A Mk 2 Lancer Assault Rifle.
The Mk 2 Lancer Assault Rifle was the second model of the Retro Lancer, produced with a chainsaw bayonet, more accuracy, less recoil, and more ammunition. Designed by Professor Adam Jonathon Fenix during the first year of the Locust War, the second-generation Lancer soon became the staple weapon of Gears all across Sera and official workhorse of the COG. It now serves as one of many primary weapons for the Alliance of Nations against the Axis of Empires. Altrough the Clone Troopers didn't found it as a weapon to be used by them or anyone at that matter at any case they call it "a bit too gory for our taste"