Sorry if this has been asked in the past. Could not find anything on this specific item. I have a Steyr M357 (what the slide says) that on paper was sold as a M357-A1. It has the receiver rail that is compatible with Glocks and other weapons. This is not the first generation receiver. However, unlike every other one on this site, my slide does not have the "-A1" after it. The slide, barrel and receiver have matching serial numbers, so I know this was not some Frankenstein monster put together after the fact. (Unless the factory did this.) Does anyone else out there have a slide with no "-A1" on it, the new style receiver, and with matching serial numbers on all three parts? Just curious. Thank you.