The common assumption is that metallurgy improvements were made and that the WW2 guns were less prone to metal failures. However, while it makes perfect sense, no one that I know of has actually conducted a test to verify that.
I can't fault your logic in shopping at Simpsons, Ltd, either.
And while you could save a few bucks buying elsewhere, you are paying for peace of mind.
Go for it!
dju
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