Good Day All!

I'm loving the early No4Mk2 that I got recently, I do have two problems however.

First, the rifle came with two magazines, one serialed (though not to my rifle) and one with no markings whatsoever (but certainly not of "new" manufacture). The serialed one is of No1 stock, with the ribs going all the way to the base of the magazine. It fits very snugly but is quite solid upon locking. The unmarked one is of No4 stock with the ribs not getting all the way to the base, and it is an act of God to get it to even look like it's seated properly. Both are worn but serviceable.

I have had reliability problems with the magazines feeding, with the bolt not picking up the next round. It seemed intermittent but I wasn't paying that close of attention at the time (idiot!).

I have read that No1 and No4 magazines are not interchangable. There is always that fine line between them "not" being so and "making" them so. I also know that each magazine (though not all, apparently) were serialed to that particular gun because each fed differently. I have also read that some people tune their own magazine feed lips to get them reliable. What would y'all advise on this?

Second, my ejection was, at best, anemic. This strikes me as highly unusual. Any sage words of wisdom other than "go buy a new extractor spring"?
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