Sounds like someone wanted a rifle to fire .22 Short, and Parker O obliged him. Not to uncommon a conversion when .22 Shorts were less than half the cost of .22 LR. Remember, for accuracy, the .22 Short requires a different rifling twist than the .22 LR those rifles were made for. (Please don't ask what the optimal .22 Short twist is; it is getting too late for a lot of research.)
To some folks, that name on the barrel would add a nice premium. To others, any work on that M2 would be desecration, and who was this P.O. Ackley, anyhow?
Jim
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