I realize this may be an Apples and Oranges question but I am considering getting something for back yard target practice. I don't want to get involved with co2 or air tanks and such but want a easy to cock pistol. I would appreciate any comments about the relative merits of the two pistols. No interest in scopes or any type of optics.
I've owned the FAS 604 for years and recently acquired the Baikal. The FAS is functionally similar to the Weihrauch HW75/Beeman P11 and the Compact (as far as the Gamo is concerned, the similarities end here). The 604 sits low in the hand, much like a free pistol. It has a nice set of sights and (in my view) a crisper trigger than the 46M (although the Baikal appears capable of having the weight of the trigger set lighter). Cocking effort is probably around 16-20 pounds, when the seals are new. I managed to find a front sight extension built by Don Nygord, which extends the sight radius about an inch and a quarter, a nice feature on a pistol that is considerably shorter than the 46M, and therefore less forgiving in terms of a steady hold. I shoot JSB Match Diabolo pellets in the FAS, which chrony around 370 fps. It is no powerhouse, but the fit, finish, and quality of the gun is markedly higher than the 46M.
That said, I like the Baikal, too. It is much longer and feels considerably more like a 10m European match gun than the FAS. Cocking, again, is straightforward, and the trigger is quite good, with a fair number of adjustments. The grip is a pretty basic affair, that you will need to shape on your own, for best fit (note: FAS guns come with their own grips, copies of the Morini match grips, considerably nicer feel out of the box than the Baikal). The 46M shooting the same JSBs chronographs about 100 fps faster, which leaves nice neat holes in your target and gets the pellet out of the barrel sooner, which is a good thing. Decent set of sights, too (with front inserts supplied, when bought new).
Bottom line, both guns have good triggers, are fun to tinker with, and will, in all likelihood, outshoot you any time. The FAS comes from Italy and has a much steeper price tag; it also feels much different in the hand, as I pointed out. The Baikal is a lot of bang for not too much buck, and is solidly built, but suffers from cruder fit and finish, which is reflected in its price; it simply does not possess the refined characteristics of the FAS. Which one is right for you? My guess is either would please you to no end. Hope this helps.