fill out your profile and check out this site. there are others, but i dont like some and other dont like the ones i like. its all personal preference. for example, i never order anything from UNcompany or WGC. it just never works for me. i order from this company and DEN trinity. but redwolf is your best bet. ill give you a tip. in the search bar at the top of the Redwolf site i just gave you, type in "M14" and hit "Enter". You will crap your pants.
http://www.redwolfairsoft.com/redwolf/airsoft/Home