I bought my 9 mm American on Feb. 2 nd. but have only put 30 rounds threw it. Have not noticed any problems so far, the magazine seats easily full or empty and i found the medium grip to be the most comfortable so far, hope to put a few more rounds threw it later this week.
I rented one to try it out.
Seating a mag forcefully caused the slide to close on it's own.
Not a big deal to me other than it's not supposed to happen.
As far as the magazine being inserted and the slide closing. S&W M&P's also do this. It's done purposely. I do not know if the Ruger is done purposely or not.