Not being able to see the rifle I can not make a positive ID but it sounds as if it may be a Japanese Arasaka with a different stock. The Arasaka had a MUM on the receiver. A lot of the rifles that made it here (US) had the MUM's ground off. The rifles were chambered in 6.5 and 7.5 "Jap".
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Ne Conjuge Nobiscum
"If there be treachery, let there be jehad!"
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