Hey Dep, the 21A is a modern present production Beretta .25 ACP. Bond in the novels carried a modified 418, a gun produced earlier last century. It is a single action gun long out of production.
As to the Tomcat, as I'm sure Searcher did, I have looked into this gun a good bit and it isn't without issues, but overall there seem to be far more who like it than have had issues. The gun seems to be ammo finnicky and there are some rounds that work for no one causing a good number of FTEs. Some guns need a little effort to find what works. Based on what I've learned about the Tomcat I feel rather good about giving it a try.
Q