I have not started my build yet. I am going to start once I get everything decided as far as exactly what I want. It has been in the works for a while but I am very indecisive. I had the idea to get the 24" criterion and get it cut to a 20". Would just be easier if I could find a 20" and not have to pay for the 24" and pay to get it cut down. I appreciate the help looking. Like I said, the only 20" I could find is the Red X Arms barrel but I have not seen any good reviews of that company.