Welcome to ASC, first of all read all the basic info in the general and faq section. Now to your question. A longer barrel will give you better accuracy and distance. However I would avoid that site. If you chech some reviews theynare given poor scores for customer service. Those guns also have plastic internals and for a few dollars more you can get the same guns with metal internals. I would suggest 007airsoft.com, mach1airsoft.com or www.mtmfg.ca
. If you are 18+ you may want to wait intil you are av'd. When av'd you will have access to the classifeds and av retailer section. There yu can get used full black guns that are pre-upgraded for about the same cost and with retailers just about anything you can dream of.