The AT4 is a disposable, shoulder-fired anti-armor launcher developed in Sweden in the 1980s and adopted by numerous militaries worldwide. Chambered around an 84 mm projectile, it is a single-use weapon issued preloaded and discarded after firing.
To those who knows, knows.
The AT-4 has functional folding sights from the front and rear. In order to use the launcher, one needs to cock it first by push forward the cocking lever. It's slightly wonky but at this case, it's usable (I hope!)
Watch out for backblast!
Model from Squad