That is an FN action. Sako #4 triggers were typically installed on a variety of commercially made FN actioned guns 1957 and later.
ETA: P.O. Ackley probably didn't build the gun. He most likely installed the barrel. Guns made by P.O. Ackley generally had his address included with the name stamp.
The guns made by Ackley will bring a premium, not too much the one's he barreled.
Last edited by sbrmike; 04/27/17.
