Semina Arms, founded in 1972 in response to the Vietnam war. They create very technologically advanced weapons, such as the Crowd Control Sound System Mk 4(CCSS-4).
Any weapon found in the game is very rare, and should be kept, it will be helpful.
Long Range Tactical Assault Weapon Mk3, An assault rifle, chambered in .444 Marlin.
PD96 "Hawk", A .50 BMG Pistol.
Crowd Control Sound System, See above.
WYD 6, A Fully automatic pistol, chambered in .357 Magnum.