Heads Up: Interesting Costa Mesa AR-180

While making my daily scan of Gunbroker.com I can across this interesting Costa Mesa AR-180.

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I had seen it before and dismissed it as a mixmaster gun with a Howa lower or it was using a former AR-18 lower.

You will notice the markings around the safety selector and the fact that the safety stops would allow for 180 degrees of movement.

I was able to figure out the serial from this picture as S3803.

AR180 Serial

I had to blow it up but I believe it is legit.

I surmise that the Costa Mesa plant was using up all the parts on hand and they used a lower that was originally intended for an AR-18 on this gun. This makes sense when you consider that the last Cost Mesa AR-180 serial was S4067 so this was probably built in the last month of production.