I have an LE6920 since the SP was out of staock where I ordered.
I am former LE and military, and am in no way worried about the LE only markings. The odds of having the gun on my person while interacting with LE, having him notice the LE/Mil rollmark, and being ignorant of the legality of ownership would be one perfect storm of bad luck. Additionally, once I explained that it was legal, asked him to call a supervisor to check, and still was arrested/had my rifle confiscated would just add to my criminal defense and hopeful monetary settlement.
I think the biggest chance of this happeneing would be some rural jurisdiction where you MIGHT have a greater possibility of encountereing an officer whose knowle of code is lacking and isn't informed or worried about liability issues.