((I thought of Ammo for the Rhino... anyway.))
(The codebreaking is definitely a spy action)
Just throwing out ideas.
Bearbreaker .61cal AMR
This scoped rifle is chambered in a new Bearbreaker .61 round, which is a .60 with a more propelling charge, and a wider variety of ammo like the newly developed AP and APHE. Having a barrel length of at least 30 inches, it is designed for a team of 2 or 3 (each will retain a pistol or SMG for self defense) to pick out machine gun nests and SPGs from afar.
Bearkiller .60cal Sniper Rifle
This scoped rifle uses the same old .60 cal, making it capable of firing the ammo of the Stallion. It is designed for lone soldiers wearing our brand new camo to kill off high-value personnel from afar.
Bearsmasher .30cal DMR
This scoped rifle uses the .30 cal, and is in some sense, a sibling of the MK-47. It can fit the magazine of the MK-47, and retains some of the automatic action, though only to cycle rounds, making it essentially a semi-auto. More importantly, there is a bolt lock equipped, so the rifle can be used as a bolt-lock if needed.
Dashbreaker 1.5" Autocannon
This gun is another development of the Bolt action system of the Cascade, and fires a new, large, and high velocity round of 1.5 in caliber, at a high rate of fire. Barrel length should be at least 60 calibers. Designed with water-cooling and belt-fed for AA versions, or as an alternative tank gun, air-cooled and speedloaded.
"Stronk" 4" Cannon
Because our T2s needed something more substantial. Long-barrel gun, designed to defeat armor at range, or, with Shrapnel shells, an AA gun.