Custom Models[Adrenaline Syringe]

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Yea I know but I never thought that this engine would have any problem with that kind of polygons!I've tried with much higher polygons and there wasn't any problems...

Weell... its not so much what the engine can handle if its driven to its limits. The thing is simply, that its more professional in general to optimize the graphics as much as possible. You never know what PC your user will have in the end or how detailled your levels are going to be. One or even ten highpoly syringes might not be a problem in an otherwise lowpoly level, but if you have that attitude for all models you create you'll soon run into problems.

Maybe you remember that thread where someone asked why his CS was running so slow? Turned out the culprit was piles upon piles of simple dinner plates he stacked in a cupboard somewhere in the room. And those were lowpoly plates, made and optimized by Frictional themselves. Now imagine what that would have been like if every plate had...say... 1000 triangles. DISASTER!

Edit: before I forget - that doesn't mean you have to throw away your highpoly models! The usual workflow in the games industry is to create a highpoly as well as a lowpoly and then use the highpoly to bake a normal map for the lowpoly. If done well, the two are almost indistinguishable afterwards.