They had durability problems and started having reliability problems with age (springs maybe?). I wouldn't expect either from Magpul. Not sure if the Ruskies got theirs sorted out. Its been since I've looked and info is hard to come by. One advantage the 74 quad has over an AR15 quad is the 74 mag is able to stay quad stack almost all the way to the top due to a lack of mag well.
74 mag is a bit different. Even if they were filled to the same office I would guess each would get their own patent.
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