I'm new to air rifles and borrowed a couple of .177 pellet break barrel rifles a friend inherited to check them out because I'd expressed interest in getting one. The first is a RWS Model 93 in good shape, shot great. It was made in Spain. I saw some new ones with scopes had gone for $150 from a pawn shop online, any estimates of the value? The second one is a project gun (or worse). It's marked "Marksman Mod 40", made in W. Germany. I found a post online that said this basically a Weihrauch HW50. Besides some external rust that would need to be cleaned off, it seems like there is an issue with either the spring or seals. Round nose pellets (10.5 grain) were dropping 6" below wadcutters at 15-20yards and sometimes not penetrating a couple layers of cardboard. Does that sound like a fixable issue? Are parts available online or would it require a air rifle gunsmith? I did some quick searches online but didn't come up with anything so I decided to ask here. Thank you.