So just a mod for HL1,Which adds on existing map,enemies and weapons from Opposing Force,and same for Opposing Force, as an e.g in opposing force you can find now hornet gun, revolver,crossbow, crowbar, gauss and gluon, and in Half-Life, you can find now, wrench,knife,barnacle,deagle,sniper rifle, displacer, shock rifle and spore launcher

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