Hi two things what is the best hop up to get for this as when a is set at full it dose not look like it is working I have had it out but still on the iner barrel it seams to to up and down but the rubber bit dose not go in to the barrel and 2nd thing thing is when pulling the trigger on single shot it will fire 5 to 7 shots the stop the u have to pull the trigger 2times the it will work again then stop again hope someone can help me