There are lots of good barrels that you can purchase for under $70, especially if you get an adapter for autococker threads. I personally like the J&J ceramic barrels a lot, but have a Lucky Un1tec set that I like a lot as well.
Have you checked the FAQ?
"Give me an army of West Point graduates, I'll win a battle. Give me a handful of Texas Aggies and I'll win a war!" -Gen. Patton
"Nothing gives one person so much advantage over another as to remain always cool and unruffled under all circumstances." -Thomas Jefferson
"Fast is fine, but accuracy is everything" -Wyatt Earp