they are just a random occurence as far as I've seen. my Savage made no4 MK1* is all parts matching and does not have the grooves so even on lend/lease rifles they were hit or miss use.
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ignore my complete lack of capitalization. I still have no problem correcting your grammar.
I never said half the stuff people said I did-Albert Einstein
You can't believe everything you read on the internet-Benjamin Franklin
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