The pull and release bolt hold open isn't stock Ruger. This is from the Ruger manual-

To lock the bolt open: Retract the bolt handle to its extreme rearward position and, while holding it there, press in on the lower section of the bolt lock. Release pressure on the bolt handle and it will move forward a fraction of an inch, and then be locked in its open position.

To release the bolt: Retract the bolt handle to its extreme rearward position and then press in on the upper section of the bolt lock. Release the bolt and it will move fully forward.

NOTE: Simply retracting the bolt will not disengage the lock. The bolt lock must be deliberately pressed up while the bolt is held fully to the rear. Only then will the bolt close when released. This is designed to prevent accidental release of the bolt from its open position.

All of the 10/22s that I have owned were NOT pull and release when I got them. It is a very simple modification to convert to pull and release. I have modified all of the 10/22s I have owned.