[Zack The Ripper]

This is my new WE Tech M4A1 AEG. Nice operation, especially for the stock model, however I am looking to get an aftermarket barrel to tighten my groupings, as well as change the hand-guard to a quad rail system, or something of the sort. Any suggestions?

PS - I'm looking to keep a longer barrel structure; I like to hit from distance. Probably picking up an ELCAN or ACOG for this bad boy.