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it will fit however if you are putting it on a rifle it will be a illegal Short barrel Rifle unless you do the paperwork and get the tax stomp

Hi Jean and welcome. Fitment on the DDM4 v7 is no issue as long as the DDM4 v7 is already in a Pistol configuration(brace or no shoulder stock). If you mean you are putting this less than 16 in barrel upper on a DDM4 v7 rifle, you are then converting it to s SBR (Short Barreled Rifle) needing NFA registration and payment of a $200 Tax Stamp. Cheers, stay legal and stay safe!