would like to build a .308 chambered carbine with short barrel and red dot type sight. the intent would be to have a handy fast action "cqb-ish" rifle that can fire same rounds as the long range bolt gun (well not same rounds necessarily just same chambering as id prolly wanna run milsurp crap). id love to hear everyones opinions on which base rifle, which sight,rails or no, which muzzle device and all the reasons behind these choices. also it seems such a rig should be economical as to maintain more funds for the serious long range stick and accesories. thanks for your input.