split the upper and lowers... look where the charging handle goes inside, see if it's really just missing the spring or if the guy who owned it before crossthreaded the screw and stripped/snapped it off in the hole.
If the screw comes out, all you need is the spring.
If the screw isn't there you'll need to have a new hole drilled and tapped for a new screw to hold the charging handle spring in place.
The safety is part of the gearbox. It could be that the arm inside the gearbox that blocks the trigger isn't functioning, or broken, or the selector plate isn't pushing the safety lever into place properly or your fire selector on the lower is completely stripped.
inspect and replace as necessary.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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