How am I ever supposed to gain quality muscular bodyweight then? 
I've been counting my calories since the beginning of the year on a daiy basis and I'm maintaining on between 4500-5000 calories a day from protein, carbs and fats. My prtein intake is around 30%, carbs at 60% and fats at 10%. If I take the carbs out my diet I'll only end up losing weight, right? I'm still trying to bulk up.
well i cant tell you with certainty any thing about what will happen from diet changes, as its your body and nto mine and it may react differently. however there are some things that will be true for everyone...
first off... you dont need the same amount of calories on a non-training day as you do on a training day. it seems to me that the amount of food you eat is perfectly fine for te days you train, but what your saying is that the days you dont train, your eating a bit too much. so, on those days, cut bak food intake to match accordingly with your reduced caloric output because your not in the gym.
secondly, cutting out carbs doesnt mean you will lose weight or even that you cant gain muscle at an optimal rate. there is still the issue of calories, and as logn as your eating enough fats to power your body in the absence of those carbs, then youll still be able to build muscle. maybe even a bit better than a carb based diet (although this probably varies from person to person)
