I've got a 510c on a tactile shotgun . It's held up so far . If I don't use it for a period of time ( 3 months? ) And keep it stored in a dark corner like just inside a closet I have discovered the reticle will not be lit up. Leave it out in the light for a short time and it will come right on. I know not the best plan being in the dark corner if you haven't intruder but it is what it is so what tells me I solar panel seems to work.
Only let that happen once and try to get it now in the light for a period of time for at least every couple weeks.
