I noticed the M40-A1 actually says A1 on the slide. My new M9-A1 only says M9. Is that the way they are?
slide was made then new A1 frames came out. steyr didnt want to remove the finish etch/stamp the new A1 into the slide and refinish. kinda process that cost money and time.
I am getting a M40 A1 in the next few days.. So far I have: M40 S40 M9 A1 S9 My collection is nearly complete!
I would call the ones without an A , a transitional gun. Second generation frame with M slide. There really isn't any difference between the slides other than the markings.