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Hi Michael and welcome. Yes you could. Cheers, stay safe and enjoy! ----- https://cmmg.com/upper-group-dissent-mk4-5-56mm-6-5

Where a 5.56 upper would fit, how would it function? There's not enough room for the bcg to fully function during cycling. You'd have to use the proprietary CMMG upper made for the Dissent.

Yes, you could.