One of my favorite .22 autos, a No. 51, which was only made from 1939-40, as I recall. Also a No. 46BT (target) with the target stock with the rail in the fore end for the sling. It also has a dust cover over the ejection port. I actually don't care much for this gun, as the bolt knob is right in the way of the knuckle of my trigger finger.