You're probably right there.
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Does the Mk5 charging handle rattle, Peter?
It does indeed! But I wouldn't call it a 'rattle' as such, just not as tight as the A3/MK4
Is the inside of the Mk5 bolt cut away so the end of the return spring presses on the charging handle? Or are all the lightning cuts forward of the charging handle hole? I read in the book that Gorge Patchett wanted the lightning cuts off center to the right. So I am guessing the cuts are forward of where the return spring seats and that area was not cut to let the spring go deeper into the bolt?