Hi all, was looking over my M1 carbine, trying to see how many org parts were on it. Seams not too many. Has rockola trigger W marked hammer stock not marked QH op slide, some green sling looks old... Sag Gear hand guard. Just a old war horse mix master. Is in the 202xxx range and has an Underwood ,9-43 so I guess that's oeg. Question is how "strong" was the rifling on theses I can see some but am guessing its a bit worn. Havent had it out yet should I replace the recoil spring before I take it out? Thinking its best to leave as is and not do the " make org" again, is part of its history. Any place to find more info on these IDF carbines and how may were brought back? It is a Standard Products . Thanks !