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Hi James and welcome. This will fit the MAC 5 but be cognizant of the SBR (Short Barrel Rifle) NFA registration requirement and $200 Tax Stamp. Cheers and stay safe!

Yes but it turns it into a SBR. I doing so you will need to pay for a $200 tax stamp to register it as such

Yes it will, buuuuut, it would change the classification to an SBR (Short barreled rifle) requiring NFA registration and a $200 Tax Stamp.