Yep. A high quality lithium MAY last 8 years. A micro is good for 5.
I don't envision a scenario where that extra three years will make a diff for you, bud. ;)
The good news is that they are both good optics. I personally prefer the micro and the problems the gun store employee explained to you are imaginary. However, you may prefer the m4s for other reasons.
My micro t1 with larue lt660 weighs less than the mount for a comp m3.
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