Has anyone here experienced their Daniel Defense MFR/DDM4 rail loosening and canting over time or with hard use? After looking over my 15" MFR I noticed that the anti-rotation tabs have a significant gap between them and the receiver. I haven't subjected mine to hard use yet but it seems over time the rail could develop a cant. Any helpful information from actual experience is greatly appreciated! I am asking because I'm thinking of picking up one of their 11.5" uppers with either the MFR MLOK or DDM4 quad rail.
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