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I came into possession of a dozen 10 shot mags. How do I tell which Mark# they are good for. I might put them up for sale but don't know what they fit.
The two types I know of: Look at the back side of the mag. If it has two "ridges" or "crests", it's for a No1 Mk3. If it only has one, it's for a No4 or No5.