While the Jefire is chambered for the .25 ACP, the Minx is chambered for the .22 short. The photos above show a 1960 Italian made 4’’ 950 B Minx (aka M4); notice there is no thumb safety on the left side. Also shown is a post-1968 American made 2’’ 950 BS Minx with the thumb safety. Both hold six rounds of .22 short in the magazine and one in the chamber; the Minx holds two rounds less than the Jetfire. The .25 ACP is a centerfire cartridge and I have found it to have more reliable ignition than the rimfire .22 short. Back in the 1960s, there were arguments over which load had more “stopping power.” While both loads can be lethal, both are woefully underpowered. Since the rimfire is more prone to misfires than the centerfire, and considering that the 950 has no extractor to clear the chamber of a misfired cartridge, the Jefire would appear to me to be the better of two poor choices for self-defense.
Why would anyone prefer the Minx to the Jetfire? One reason I can think of is the cost of ammo; .22 short is far cheaper than .25 ACP. Another reason is that a standard velocity .22 short has a comparatively quiet report when fired, which is something of value if one is trying not to attract attention. NOTE: The standard velocity .22 short may not cycle the action of the Minx properly, you may be better off loading one cartridge at a time via the tip-up barrel. Even with high velocity loads, my 4’’ Minx seems to cycle better than the 2’’ Minx, probably because of the added blowback pressure from the longer barrel. The slide on the 2’’ American made Minx may have more mass than the slide on the earlier Italian gun. The shorter barreled pistol seems to cycle okay after firing a few rounds, maybe due to the added blowback pressure from having a dirty barrel. In brief, I find my older Italian Minx to be more reliable than the one made in America. The Italian guns show some quality hand fitting, including fitting the mag to the pistol. The American made Minx makes good use of “allowable production tolerances.”
The slide on the Italian made Minx is marked “Tipo Flobert”; years ago, I assumed that was the name of some gun-designer working at Beretta. Now I believe it simply means "Type Flobert", “Flobert" being an Italian or European designation for the .22 short, maybe for rimfires in general (after the Frenchman who invented the metallic cartridge by shoving a lead-ball into a percussion cap. Pronounce it FLOWBARE).
The Minx can be a fun, affordable gun to shoot. I have a bit of sentiment for them; back in the days before guns were evil, my first pistol was a 4’’ Minx.
EDIT: CLICK HERE TO DATE YOUR ITALIAN MADE BERETTA