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Identifying Receiver Brand?

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Hi all,


After not playing for years, I've decided to get back into the sport. I've been looking around for a project gun to sink my teeth into - I got lucky as an old mate sold me a TM MP5K which needed cleaning and regreasing. However, he also threw in a full upper from an M4.


I'm planning to use it as the base for a Polish GROM-style M4A3 platform. I want to know the brand of the upper assembly, but there are no trademarks present. It's just a full metal upper receiver and railed handguard from a CQBR-style M4. 


Is there any way of determining the brand of this receiver?

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