I bought a used, nice condition, .22LR H&R, top-break,9-shot Sportsman Model 777 at Cabelas two weeks ago. Problems: When closing, the cylinder jams against the rear of the receiver; I think it should retract fully, automatically. Also, shoots about 3 inches off, at 11-O'clock. Sights seem not adjustable. I'm still within their 30-day return, but I like the way the gun handles. And the price was right. Any suggestions?