This 8-round rotary mag or clip is for the Crosman Z357 Ztorm or GameFace GF600.
Update: It works! Use a 15/64" drill bit and slowly drill holed so BBs are held in clip and clean up edges if supports are used (recommended), but still shoot easily. Accuracy seems same. will use chronograph on both to see if any difference as soon as it comes in.
Update: not a lost project, i have moved to the H8R revolver now but will chrono this vs. original clip. Problem i had is i ordered from china a month ago and got updated with a refund saying they were out of stock, so chrono (for usa variant) in a month or so.
Also if you wish i can post a accuracy test and better photos, but as of now no one has complained :P