Welcome. MOST people here, as all sites, are friendly, polite, and more than helpful. Remington bought Rohrbaugh and makes a plastic

frame .380. I am unaware of them bringing the R9 back. IF they do I would bet it is also plastic frame, I have owned 'plastic guns' but life is too short deal with that crap.
It is probably a combination of cost, and lack of master gunsmiths keeping Remingtonn from the R9. I bought mine 30 days ago and just picked it up yesterday. After 45+ years shooting, and over 300 firearms, the only thing CLOSE I have ever seen is a $4500 Cabot .45.
As to mechanical issues others with more R9 experience will hopefully chime in.
The designers, engineers, and builders of the Rohrbaugh are all members here. They built a MASTERPIECE of engineering but are enjoying a well deserved retirement. If only you, or I , could leave a legacy like this.

kevinqjhps
p.s. use Winchester Silvertip, or regular Winchester HP ammo. DO NOT USE +P OR +P+ ammo, may damage firearm. I have also read of others using Tula ammo, won't fire because of the hard primers. With a gun like this don't cheap out on ammo. Stick with the regular Winchester.