Here's some concept designs for the various weapons used by the Unitary military. These are the standard load out weapons and don't include heavy support weapons, special variants, or unique weapons used by some militia forces.
(Note: some weapons are not to scale)

Karabine R-45: The standard rifle issued to militia troops across the UCR. While these weapons are durable, easy to produce, and pack a major punch, R-45s have a cool down of several seconds after every 3 shots. This drawback is made up for by the issue of bayonets for situations where the enemy reaches in melee range.

Karabine SM-69: The standard issue rifle to army troops across the UCR. SM-69s are fully automatic laser rifles unlike the R-45 and can unleash a volley of laser fire upon the enemy. Despite this advantage, SM-69s have weaker firepower per individual shot and tend to dry up battery packs much faster.

Karabine MG-99: A light machine gun used by the Unitary military for infantry suppression. Powerful and portable, the MG-99 can unleash near continuous volley of laser fire as long as its battery source doesn't drain. Can be mounted on tripod mounts or tanks.

Karabine SR-56: The Unitary's primary sniper rifle. The SR-56 is often equipped with a targeting scope to help snipers locate their targets and a silencer.

Kruger: A common sidearm in the Unitary military, often used by officers or vehicle/ship crews.

Uberlaz: A powerful laser gun used by high ranking officers or elite forces of the Unitary military such as Crusaders. These weapons are able to punch holes in tanks and other targets where normal laser guns would only leave a burn mark. Essentially the Bolters of the Unitary military.

Plasmawaffer: Handheld plasma weapon used by heavy UCR infantry units, most often strumtroopers. While significantly weaker than the plasma weapons used by ships or tanks, Plasmawaffers are no less dangerous than their large cousins and are able to liquefy flesh and cut through armor like its butter.

MPG AT: The Unitary's dedicated infantry AT tank weapon, MPG ATs are quite self explanatory.

Feuer spitter: A flamethrower weapon used to burn enemy targets either by fire or plasma.

Granate launcher: The UCR's mainline grenade launcher. Able to carry up to about a dozen grenades in its ammo compartment.

Granate AP and AT: Grenades used to take out infantry and armor targets respectively.

Sidesaber: Often used in both combat and ceremonial duties, the sidesaber is pretty much only used by officers of the Unitary's military.

Sawsaber: A sidesaber equipped with a chainsaw rather than a sharpened blade. Only issued to the most decorated officers or inherited by family.

Combat knife: A standard issue combat knife. Good at cutting rationed food and fingers.

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