R.C., I looked at "your" gun. Dunno what those goofisies at Cabelas told you but that Scott has rebounding hammers built on the Stanton patent. Most rebounding locks don't move the hammer back far so you've got to really look hard to see what it has. Just might be a pretty nice gun, especially at that price. And you've got the right to return it in a 30 day period. Not bad.
Bet'cha the rib extension hasn't been repaired. That sucker is usually brazed on (I think) and it'd be very unusual for it to separate. Someone probably tried to mount a sight or something. Who knows.
Back to non-rebounders: If the locks are in good condition they're as safe as any system ever devised by man, other than an unloaded gun! I sorta like 'em. At half cock they're a lot easier to pull back to full than non-rebounders. And they just look sexy what with those big hammers sticking up real proud....time was when I did too.....