I'm not sure, the ones I've seen have been Aliexpress copies. Inferior machining/tolerances/materials.
Ive got a knock off one if anyone wants it. It clips onto a rail like the Atlas does. Never been used.
Make me an offer and pay the freight. You will get a USD price indication off Ali express.
Edit: Here you go https://www.aliexpress.com/item/3303...chweb201603_53
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