i got a sps tactical 308 about 3 months ago and i don't no if it's normal or not but all the blueing on the bottom of the locking lugs is worn off already also the blueing is thining on the body of the bolt
i've only fired 40 rounds through it but have done a fair bit of dry fire practice with it
(i clean and lubricate it before i put it away ever time i use it)
It's normal actually... the more you use it and the surfaces begin to mate together it will wear down the hi spots. It should get smoother the more you do it. Just make sure to keep it well lubed (not tons but don't run it dry).