A suitcase big enough to fit one person in

She fires while kneeling

The launcher pops up from the suitcase

If the tripod is removed, it could actually fit in the bag realistically.

K4 Grenade Launcher (Daewoo Precision Industries)

The issue is the approximately 60~80kg weight of one.

Since DEs separate the slide and the barrel, you can see a unique firing animation when shooting.

Average pistols have the inner barrel visible only when firing.

Drops magazine with one hand

Inserts mag, then brings slide forward using the slide release.

Same technique as Mari. Grips the pistol with left hand.

Left-handed shooting. Also fine with firing 3 shots in a row with it (Skill 1)

A circular gunsight, with no separate ammo drum attached.