So just curious, how are the two pre and post DIARM AyA companies different?
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Its hard to know where to start, as there are more differences than there are similarities.
The pre-DIARM AyA, as a company, emulated Victor Sarasqueta and became an enormous company. That original AyA made most of their own parts, and became so good at making parts they became a major supplier of barrels and locks to the smaller, boutique, gun makers. At peak, the original AyA offered over forty models of shotguns across a huge range of price points, and looked more like a factory than a workshop.
The post-DIARM emerged as a small, boutique, gun maker less than one-tenth the size of the original AyA. It has been through at least three different business models since it was founded. Originally, it tried to offer the same range of AyA gun models as had been offered by DIARM, (about a dozen different guns) and made no attempt to build anything like the range of guns offered by the original AyA. In the most recent business model, they offer fewer than ten different guns (under a dozen or so different model designations), and are attempting to begin making their own barrels.
All that is tip-of-iceberg stuff. Pre and post AyA are so different, and the Spanish shotgun making trade itself is so different between 1980 and now, that these kinds of comparison are just about meaningless.