Well, first of all, I just bought an Mp5-J that I'm eagerly awaiting which will become my CQB weapon, that means that It's open season on upgrades for my M16A1. I wanna get started researching what I can do to maximize the range, effectiveness, and "cool factor" on my old A1. Keeping in mind that this project will not take place till after I get myself set up with a good tactical rig (my current one is a mixture of surplus army crap and homemade crap, just barely functional). My question is this, other than a scope and internal upgrades what can I do with the A1? Most handguard/rail mods wont work on the A1. I'm thinking either a 203 or the Masterkey shotgun I've seen pics of. Any other mods that go well with a M16A1? Second thing is I've never cracked open an AEG mechbox, should I attempt the internal upgrades myself or pay someone to do it, I'm not really worried about downtime as long as my MP5 works up to par. I just dont know how sensitive these things are and dont want to mess it up permanantly.