CZ spring noise

[Heimrick]

On one of my CZ858 I can ear the main spring when i'm pulling the action open (without a mag). Its not a big noise, just like the spring was rubbing lightly against steel. The action is flawless and the gun too, but since my other CZ doesnt make that noise I was wondering if it might be something I should be concerned about?

thanks for your help guys

 

[Mr.4x4]

A wee coat of grease on the spring.