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John, wish I could say for certain but, us community members do not have access to Buds inventory (we're customers same as you). Buds Customer Service will need to verify which with their Inventory Dept. at 1-859-368-0371 9am-9pm EST Mon-Fri. or use the Blue Chat now button at the bottom right corner 9am to 9pm Mon - Sat and 9am to 7pm Sunday.
Unfortunately the item is not showing on IWI's site, so I can't say for certain. It would be best to contact IWI directly about their product to confirm which mag release it has. They can be reached at 1-717-695-2081 Monday - Friday: 9 AM - 4:30 PM ET, or on their contact page here: https://iwi.us/support/contact/