Recent Echo1 rebrand guns often contain upgrade parts relative to their OEM-branded products, typically Madbull, usually the piston and/or bucking. While the overall construction may be the same there is some differentiation in the products that are destined for Echo1's USA and Europe products. I am not sure if this extends to the practice of "binning" or higher-QC batches like is supposedly happening with the Umarex USA stuff.
You can glean more information about this by watching the Echo1 tech support channel on YouTube, or you can just straight up ask Brian Holt at Echo1 through email/facebook/youtube. If the possibility of slightly upgraded parts and a very responsive and helpful tech support channel matters to you, the Echo1 product may have the edge.
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