Can anyone make some suggestions of scopes with 1x-___ zoom and calibrated for an M4 with M855?

I'm currently considering the Norden/GRSC CRS scope, but would like to have a few other options to choose from...

ACOG all he way. If you can afford on that is. They are the best IMO. Very durable. I beat mine to death.

ACOG is not a variable zoom, which he is asking for.. but the Trijicon VCOG is and they are going to be released early next year.. it depends on his price point really.. I have an Elcan SpecterDR 1-4x on my SCAR 17S and love it, but it really depends on what your budget is and what you want to use it for..

There's no budget really, but I want to get what I pay for. I'll be getting a pair of something for my TEOTWAWKI rifles, so they need to be rugged and ideally not require batteries (although optional battery features with long life would be alright). I wouldn't want to cheap out and have a scope crap out on my while the SHTF.

The VCOG seems a bit overpriced for its features [or lack thereof], but will be an option. At least its single AA battery is boasted to last up to 700 hrs. That's a battery powered option I could live with.

I'll have to look at the Elcan a bit more. It seems like an option too.

Im not an optics guru, but the only no-batteries variable I know of is Trijicon Accupoint. Very high quality and sounds exactly like what youre looking for.  I just got my first acog, and it is perfect, so I agree with that recommendation as well

The reticles available for the 1-4 Accupoint are absolutely useless. What a dreadful $1000 paperweight. I'd rather have batteries. I appreciate the suggestion, but that is definitely not a contender. LOL