Yeah Czechoslovakias economy has really gone downhill since the 1990s
As for the cost issue - you have to take into account shipping and import plus margins. Of course, the labor cost is lower in the Czech Republic than it will be in the US, but you save a lot of money not having to go through the whole import process and not having to pay for transatlantic shipping. This is not only about the cost of the actual import and shipping, but also the cost of the administrative segment behind it. Depending on the actual process they may also cut out the middleman and save on that part.
Price politics and manufacturers/dealers margin also have an important role. Some firearms are actually sold for a better price in the US than in their country of origin, simply because of the more competitive market - so producing in the US does not automatically mean a change in consumer price, but maybe just a change in CZs margin