Seen in the hands of Sea Star crew members Steve Baker (William Baldwin), Richie (Sherman Augustus) and Captain Robert Everton (Donald Sutherland), when they board the derelict Russian Ship Volkov.
The Chinese Version of the RPG-7, the Chinese Type 69 is seen in the weapons locker and two of them are carried by J.W. Woods Jr. (Marshall Bell) at the same time.
A Stechkin APS pistol was used as the main weapon of Volkov Captain Alexi (Levan Uchaneishvili) (who was turned into a cyborg by the energy alien). The pistol would later fall into the hands of Richie after he finished off the cyborg.
Used by the main characters in the film, noteably in the hands of Steve Baker (William Baldwin), Hiko (Cliff Curtis) and Richie (Sherman Augustus) . AKM rifles were also seen in large quantities in the Volkov's small arms locker.
The BG-15 grenade launcher was a front loading 40mm launcher introduced during the Afghan-Russo War. It is identifiable by a thumbhole in the short pistol grip. It was later supplanted by the improved GP-30 & GP-25 launchers. The one in the film has a thumbhole in the pistolgrip, however it seems like a breech-loading launcher which would mean it is not a Russian BG-15.
In the Volkov's small arms locker, a number of Norinco Type 56 rifles (both the folding bayonet variant and the variants without the folding bayonet) can be seen on the gun racks next to the AKM rifles - which is odd to see because the Volkov is a Russian naval vessel and the Norinco Type 56 is a Chinese rifle. It is quite possible that the Type 56 rifles were used as a "stand-in" for the Russian AKM rifle.
A mocked up East German MPi-AKS 74NK is seen carried by Woods (Marshall Bell). It is built from a short barreled Norinco Type 56 AK with an East German side folding buttstock.