Aerosmith SurePin CT90 Concrete Nailer. Works but does have an air leak. However there is a complete rebuild kit included with the concrete nailer.
However it did shoot nails well into concrete and I suspect the air leak is an easy fix. This item is in the category "Business & Industrial\Light Equipment & Tools\Powder Actuated Tools". The seller is "garon99" and is located in this country: US. This item can be shipped worldwide.