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GBB upper reciever, replica of A3_UR_lite project

GBB upper reciever, replica of A3_UR_lite project

grabcad

THX to the engineer built the original model, there is only a little modification of the model, cause the bolt-catch is different, and I closed the the gap on rail of the original model, just for a easier 3D printing. no 1:1 printing test, time killing

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