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Hi Sammy, yes this will work with CMMG mod4SA MK4 Stay safe & have a great day!

Hi Sammy and welcome. There should be no fitment issues however, I would confirm with Wilson Combat Customer Support at 1-800-955-4856 office hours are Monday - Thursday, 8:00 AM to 4:30 PM Central time, excluding holidays. You can also submit an online inquiry directly at : https://wilsoncombat.com/wc-contact-us -------- Cheers and stay safe!

yes it will fit and work just fine

Good evening to you!! The Wilson Combat Match Grade Barrel 16" 300 AAC Blackout/Whisper (7.62x35mm) 416 Stainless Steel will work 100% in your CMMG mod4SA (mk4). Hope this helps. Have a good rest of your day.

Yes, it would fit & function properly.