I'd would agree with the forward / back comment, and yes with them being all in one with rings they are a bit lighter than the piccatinny and ring type. Have not come across any that did not line up yet but all the ones we have sold so far have gone with the rifles they came in with. The few I have were where someone swapped the mount out for an extra magazine which is how we ended up with spares. I think there may actually only be one but I am yet to locate it. It may well be for the M100 version which is a bit lower and angled forwards more.
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