I own a modified diana grade sxs. Mine is Damascus. And shoots fine...bore cond is a big thing...rust...pits? Dents...
Also if gun has play when closed or snug.
The breaches are not same metal as the barrels..the laminated barrels are joined to the monoblock...if there is excessive erosion between the chambers and bores...id not shoot it. The chambers on these guns are 2.5" BLACK POWDER PROOFED ONLY no modern ammo...VALUE VARIES GREATLY IN REGARDS TO BARRELS BEING SAFE. If you intend shooting it. 2.5 " rolled crimp black powder loads only and use of fiber wads not modern plastic wads. Black powder and plastic do not go hand and hand... The guns can be used with proper ammunition and proper cleaning afterwards is a must ad black powder is very corrosive and any form of pattern welded barrels
Are weakened by pitting...thus it needs a thorough examination before you shoot...value could be. From a 100$ wall hanger to a 700$ shooter.. Prices vary.