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GBB upper reciever, replica of A3_UR_lite project

GBB upper reciever, replica of A3_UR_lite project

grabcad

The engineer constructed the initial design; however, minor alterations were made to it. The bolt-catch was changed, and the gap on the rail was closed in the modified version to facilitate 3D printing. No full-scale printing tests have been conducted yet, as it serves as a time-pass activity.

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