Eotech 553

I was wondering if anyone knew if sf groups still use the 553 eotech, I know it was discontinued a long time ago and eotech actually traded out the 553 for the exps series for units that had malfunctioned but I see quite a few 1/6 companies putting the 553 on weapons, I didn’t know if this was just an oversight on the manufacturer’s part or if there’s current reference of the 553 still in use, for those curious the 553 was discontinued due to batterie connection issues, apparently the terminals would rattle loose during firing so the sight would lose power and shut off