I know a guy at a gun shop that has an SU 16 B for sale for $495.00. It is his gun & he's shot a few hundred rounds though it. He's including rings for a scope & shell buffer if I want to have it installed. Is it needed or is there no problem with possibly getting hit by shell casings? Also, Gear reviewer Nutnfancy on You Tube has a gun review he did on the SU 16 C in which he shows that you can lock the action open. Is this also the case with the SU 16 B? I generally like to store my semi-autos with the safety on & the action locked open.