This might be a myth busting question but enquiring minds have to know...

I continually see sellers comments that jungle carbines had their bolt handles drilled out to reduce weight, the trouble is I see drilled out bolt handles on all kinds of no4 enfields, and including one here with an A suffix, which would indicate that at least early in the war they were already drilled out then, for what reason I don't know.

Is a drilled out handle a sign of a genuine no 5 bolt when on a jungle carbine and would that then mean that a non drilled is not correct equipment?

Does that mean that the drilled out handles on no4's we see around today were just a random installation from some bolt maker who was making them with the hole, or are they retrofitted from later carbine production?
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