Hey guys im getting crazyNCman's kwa lm4 in the mail next week and i was wondering what upgrades you guys think i should get for it. internal and external. i want this to be an awesome looking gun but still ergonomic. it cant be over 400fps so i dont think i will be altering any valves. so far on my list i have got. external: -sightmark ultrashot (already have) -magpul pts mbus sights -ncstar single point sling -magpul moe trigger gaurd -magpul pts afg2 -armoror's wrench -magpul moe grip -some cheapish tac light (thoughts? needs to have strobe) http://www.amazon.com/gp/product/B000WQHRRG/ref=ox_sc_act_title_2?ie=UTF8&smid=A1KSNF4J3UCP19 -a 13" rail that im not sure if it fits, any idea on this? http://www.evike.com/product_info.php?cPath=25_106_286&products_id=36981 internal: -RA tech hop up unit -RA tech 6.02 tbb -RA tech blue bucking -A+ studios reaps bucking (i will try both to see which is better) -a2 RS metal buffer (needs to be cut down) -steel buffer lock i will do boobiem4h's hop up mod on this so it uses the ball bearing instead of brass tab.