80% lowers have no serial number. A serial plate is embedded in the polymer allowing you to serialize it when completed.
The SS80 is made with a much stronger and more durable nylon/polymer blend that is similar to the original 43 but actually dampens felt recoil and provides even better reliability. You'll notice the grip texture immediately. It provides a rock solid grip that feels good and is strikingly attractive. The frame is shaped with a double trigger undercut allowing a higher grip on the gun, reducing felt recoil and improves speed and accuracy.
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