Sorry and i will do an introduction after I answer this, I have an Aero Precision Upper and lower M5, I also have a BCG and bolt(308) and charging handle. I'm trying to get a 18-24" barrel and a 15" handguard but unable to locate any. I really don't have a budget and would like to get a proof research or Christenson Arms barrel or a comparable one for accuracy, also any tips on what trigger is the easiest to install? I'm not opposed to 6.5 Creed more just unable to get bolt. Thanks for your time!