Could someone tell me what the RIS is really good for? I know it helps you mount extra stuff, but Is it really that helpful? What could I mound w/ and w/o the RIS. Also, can Someone tell me about the barrels on the SIM-4 and the WG-65? Which one is more accurate (stock)? Are new barrels even neccisary? I currently shoot a Tippmann 98c w/ a Flatline system, and I'm loving it. Which one of these guns has the range and accuracy of the flatline? Help is very appreciated.