I am just getting into rifles, and figured the best way to learn about an AR is to build one myself. I know that I can buy an upper in any configuration that I can dream of, most likely for cheaper, but I want to do it this way. I do already have an AR pistol that I bought fully assembled and ready to rock. All I did was pull off the BUIS and put on a red dot optic. I want to make a 16'', relatively light weight (I think) rifle that is fun to move and shoot. I'm not a target shooter by any means, so I'm sure any rifle will be better than I am. The 16'' is really what I'm most set on. I may end up with a not so light rifle in the end compared to others, but I'm ok with that. What I need help with, is what parts I need, what I'm missing, and where to get said parts I don't have. I just bought a lower (with lpk installed) and an assembled YHM A3 upper reciever. Now I need to actually figure out what I'm going to do with it, and turn it into a rifle. This http://www.midwayusa.com/viewProduct/?productNumber=989015 This link doesn't work anymore. I think it may have sold out. Here is the stripped version: http://www.midwayusa.com/viewProduct/?productNumber=717820 and the lower from http://timberwolfwarrior.com/index.htm I don't have a buffer tube or anything of that sort yet. I don't have a stock picket out. I believe I can get a kit for all of this. I'm thinking of the VLTOR (http://www.bravocompanyusa.com/Vltor-Carbine-Modstock-Basic-Kit-p/vltor%20acbk-2s%20black.htm) or BCM (http://www.bravocompanyusa.com/M4-Stock-Milspec-p/stock m4 milspec black.htm) though I am open to options as well. I don't have a barrel picked out, but I do know I want a 5.56 chambering. What do I need to look at in regards to midlength vs. carbine length vs. rifle length gas ports? I think I need something like this: http://www.midwayusa.com/viewProduct/?productNumber=461614 I need a BCG and charging handle of some sort. I want to have a rail system, but know what yet. I have seen the YHM and DD rails systems, and they both look good. I do not want the standard front sight gas block as I already have iron sights that go on a rail. What type of gas block and gas tube do I need. Do I need the rail to be 12'' or so, or can the sight be more toward the rear? Does this matter for anything other than sight radius? Would I be looking at either of these? http://www.bravocompanyusa.com/VLTOR-Low-Profile-Gas-Block-p/vltor gas block gb-2s.htm or http://www.bravocompanyusa.com/PRI-Gas-Block-With-Top-Picatinny-Rail-p/pri 05-075-04 gas block.htm or http://www.bravocompanyusa.com/Midwest-Industries-Low-Profile-Gas-Block-p/mctar lpg.htm This is where I have the most confusion on the build. Do these come with the pins or screws needed for instal? Do I need a muzzle break or comp? I was looking at: Noveske KX3 http://www.bravocompanyusa.com/Noveske-Krink-KX3-Flash-Suppressor-with-Pig-p/kx3 pig.htm PRI MSTN QC brake http://www.bravocompanyusa.com/PRI-MSTN-QC-Brake-p/pri qc comp 05-0089b.htm Phantom 4 port http://www.bravocompanyusa.com/flash-hider-phantom-YHM-p/yhm-28.htm Am I missing any other parts? I have already read the tutorials for building your own AR on arfcom, but I want to check with people on a site that I am a member of. Thanks, and sorry for all the links. Heres the pistol I already have. It does 2'' groups at 100 yards with a 7.5'' barrel.