[Hammer1]

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What are the features that distinguish a Ljutic ARS from other Ljutic models ?

Don't see an ARS on the Ljutic website.

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[Rastoff]

The biggest difference is the rib. The ARS was the first adjustable rib offered by Ljutic. They only produced it in 2004 and 2005. Then the company was sold. The new owner designed the One Touch rib and didn't allow the ARS after that.

Another feature is the Inverted Cylinder chokes. I don't believe they were offered on any other gun, but I don't know for sure. They are unique in the shotgun world because they look like this:

The dimensions on that pic are exaggerated to show the internal shape.