At the Great Outdoors show in Harrisburg, PA. I stopped at the Remington booth and talked with some company reps. They expect a 40 Cal. model to be released in about a half a year.
They had 6 R 51s on display. 3 had Crimson Trace grips. I liked the gun but I wasn't impressed with the trigger pull. The gun has a true internal hammer but the trigger pull made it feel like a striker fired semi auto with a plastic frame. Since it does have a traditional hammer, the trigger pull may improve as the gun is fired and used.
I also called the Remington customer service number a few weeks back. The person handling the call had no knowledge at all about a 40 cal. model. He added the bosses didn't even make an anouncement about the R 51 to the customer service staff. So I would take anything they say with a grain of salt, at this time.
I am very happy I got to handle one. It's a nice pistol and it should be a good alternative for shooters who hate plastic frame guns. I was planning on ordering a 40 cal, but now I'm not so sure.
I have a ton of modern carry guns to include HK, Glock, SIG, plus all my 50 + year old 38 Special snubbys. I really don't need another carry gun.
Now I'm thinking I would enjoy an original Remington Mod 51 in .380 a lot more than the new offering. I have tentatively started to look for one.