I prefer my version of NLB.
Make the iron sights less intrusive.
Maybe remove the red sight effect when ADS.
First perk is a choice between two perks; either target marking like the fang of ir yût, OR mida style movement speed.
Then a choice between three perks; armour piercing rounds, firefly or increased reload speed.
Last perk speeds bolt action speed by two (or three?) after a presicion kill.
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I like your version. I think NLB's exotic hidden perk should be that it has AP, High Caliber and Skip Rounds all in one.