G&G's standard rubbers are amazeballs, I'd just stick with that if it's working for you. My G&G MP5 could lift .43s and fire them straight about 30m, it was insane They were probably flying slow enough to outrun them, it was ridiculous.
oh ok then. Did not know that. so just a madbull and what else should I upgrade for accuracy ( ik tightbores don't do too much to accuracy)