Hi. I'm going to own this air rifle soon and it will be my first PCP. I have been reading up on this rifle as to modify it. So far I'm going to put a TKO trigger on it and maybe muzzle brake. I cant have this be any louder than my Gamo Varmint Hunter with gas ram. What is the deal with the barrel? Does it need a second clamp? Out of the box, will I need to disassemble, clean, and de burr? This is new to me and I want to do it right the first time.