I am certainly no expert, but here is what I do know. JJCO NYNY, is John Jovino Co. who was the importer.
My personal experience is that a lot of the rifles that were marked DP were otherwise good rifles unless the were demilled by milling holes in the receiver and barrel. I have had a few of these heavily demilled rifles and there is no way you could shoot one safely.
If the headspace checks out and the barrel is good, it is probably a good rifle.
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