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John, hks model MK3-A works with the old cobra's. You want the hks ds-a for the new cobra's/after 2019. here's a link to the one you want for the new king cobra. Hope this helps and you're very welcome. Link here.......... https://www.budsgunshop.com/product_info.php/products_id/82018/hks+speedloader+for+colt+detective+special+%26+diamondback+rev

John, 2 options, economy : https://www.budsgunshop.com/product_info.php/products_id/82004/hks+speedloader+for+colt+king+cobra+%26+ruger+security+six --------------------- Upscale : https://www.amazon.com/dp/B07BFK3DJ4/ref=sspa_dk_detail_0?psc=1&pd_rd_i=B07BFK3DJ4&pd_rd_w=26V73&content-id=amzn1.sym.e620829b-a408-427e-99ea-7ac734a316f7&pf_rd_p=e620829b-a408-427e-99ea-7ac734a316f7&pf_rd_r=V6H71P239VGWZENSCESF&pd_rd_wg=1crTs&pd_rd_r=8568008d-e98f-4994-81b6-a4910dd225f8&s=sporting-goods&smid=A2ELSKIX3ODGB3&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzQ0w3UkFMNTBPUDNYJmVuY3J5cHRlZElkPUEwMzY5NTU3M08wTkRKV1cxQzlNTCZlbmNyeXB0ZWRBZElkPUEwNDA4MjU2MjVTVThHSktJVU5YUyZ3aWRnZXROYW1lPXNwX2RldGFpbF90aGVtYXRpYyZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=