I have a used High Standard Olmypic O-101. This Fourth Model features an interchangeable with a push button takedown. It can accept barrel weights (no included), built in muzzle break, adjustable rear sight.
HIGH STANDARD MFG CO. Olympic
UPC : ECOM00129147
Caliber : .22 SHORT
Finish : BLUE STEEL
Capacity : 10+1 ROUNDS
Action : SEMI AUTO
Barrel Length : 6.75 BARREL