Grab the PSG1 definately. For sniping it does have an advantage over AEGs - it operates precocked, i.e, the spring is compressed, you pull the trigger and it immedietly fires, instead of winding up first like an AEG.
Keep the PSG1, buy a used M4 here, and keep both. M4 for medium ranges or even CQB, and the PSG for sniping. I sure as hell wouldn't mind owning a PSG1.
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