I've used the King Arms ACOG type red dot they are quite good for the price, I've even used them on my GBBR without issue.
If you want a almost bomb proof red dot without going to a real steel Eotech or Aimpoint try the sightmark sold by BBbastard they are actuall very good for the price, I have it mounted on my RS CZ and my 870 Shotty
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