Daisy 717 shooting low - sight defect?

I regrettably sold mine to a friend who bugged the heck out of me after he shot it with my improvised scope set up using see thru 22 dovetail scope rings clamped to the barrel head shots eliminating pest birds and rats in a warehouse at distances from 6 to 11 yards with effortless pumping and ultra quiet report. It was ridiculously accurate shooting cheap Beeman Black coated hollow points that's made in China and Gamo Match and Wal-Mart Crosman Premier cphps. Later sorely missed I later purchased a 722. 747 and a couple of 777s and I must say the 717 would give it's LW barrelled brothers a good run. YO!