I have a pretty specific question for anyone who has some experience changing parts on the PA-10. I have been debating on getting a SCAR but can’t get myself to pull the trigger with that price tag. So instead I have a Gen 2 and I want to transform it to a battle rifle and would like to put a shorter barrel on instead of the 20” one. So does anyone have any suggestions on a super reliable 16-18” barrel, BCG, and buffer system combo?