Good afternoon to you!! I would call radical firearms and talk with there customers service at the below contact information. Radical Firearms LLC 4413 Bluebonnet, Ste 8 Stafford TX 77477 phone: 281-207-8788 fax: 281-207-8910 email: info@radicalfirearms.com or radicalfirearms.com. I hope this helps. Have a good rest of your day.
🇺🇸🇺🇸 'Merica' 🇺🇸🇺🇸

I’d call Buds Customer Service @ 1-859-368-0371 9am-8pm EST Mon-Fri and ask them for help.

Hi Dennis and welcome to the community. Since dedicated 6.5 Grendel and 6.8 SPC magazines have a slight feed lip difference, I would contact Radical Firearms LLC 4413 Bluebonnet, Ste 8 Stafford TX 77477 phone: 281-207-8788 to verify that what you received is what they intended. Either response, I would trust their judgement as I'm sure they would have done extensive reliability testing. Cheers, stay safe and enjoy!

It is advisable to use dedicated magazines for each caliber to ensure optimal performance and reliability. So I'd give Buds Customer Service a call at 1-859-368-0371 9am-8pm EST Mon-Fri and ask them to help out. Now if those magazines came direct from the RAD, then you'll need to contact them.
Radical Firearms LLC 4413 Bluebonnet, Ste 8 Stafford TX 77477 phone: 281-207-8788 fax: 281-207-8910 email: info@radicalfirearms.com radicalfirearms.com • Contact RADICAL FIREARMS for an RMA (Return Merchandise Authorization) number.

Hi Dennis, that is interesting. Have you tried them out yet? If that's what came with, I'm sure they will work. Thanks for the information.
Stay safe & have a great day!