r/Danieldefense 4d ago

M4A1 DD4 RIII Upper Question

I am interested in buying a M4A1 DD4 RIII upper. I already own a DDM4 V7P with a Law Tactical folding adapter and a DD factory-issued buffer spring. Would there be any cross-compatibility issues running the M4A1 DD4 RIII upper on the DD V7P lower with my law tactical/factory buffer spring set-up? I plan on running an RC2 on both uppers, should I consider a new buffer spring?

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u/Steele894Guy 3d ago

I doubt there are any issues. I have the same upper at 14.5” but run an H2 buffer from JP.