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https://www.optics-trade.eu/us/manufacturer-smartclip.html

Nice clip but I don't think Id bother swapping to one if I already had a rusan. The infiray one that came with the ch50 was...

Dont stress the zeroing set up. Its a one time set up, simply fit, shoot, measure the distance of impact from point of aim then adjust the appropriate axis the correct amount, shoot to confirm. ...

Rusan are Croatian I think but yes very good solid bayonets . The other option is Smart clip from Slovenia which I prefer due to the locking mechanism. Its not better mechanically but has a cleaner...