Rob
The first time I ever picked up a Beretta Cougar was at a trade show. This particular trade show includes hands on range time. Not a bad shooter, trigger reset is too long. However, when I did a reload from a lockback, I lacerated the sh1t out of my support hand fingers on the underside of the slide. I ended up bleeding all over half the booth.
Not long after, I directed a test of duty pistols for a Police Department. Included in the test was H&K, Beretta, Smith & Wesson, Glock and some others. Among the pistols sent by Beretta were a 9mm and a .40 Cougar.
Halfway through the first day of shooting, I look down the line and one of the Officers is holding a Cougar frame and the slide, barrel and recoil spring assemble were scattered of the ground three feet in front of him. I go to ask "exactly what the 'F' he thinks he's doing". He starts stammering about how "It just 'popped off'".
Later that same day the same exact thing happens. The pistol "auto disassembled" on the draw! Not completely this time, but enough to take him out of a fight. This time I got a picture:
Investigating a little, we found that the problem was the location of the disassembly latch and (believe it or not) the Cougars ease of disassembly. When a pistol is draw, the shooters finger should be in a "Universal Cover Mode", meaning that the trigger finger is well above the trigger guard or below the trigger guard. This is to prevent "Involuntary Muscle Contract" or a startle response that will make the Officer negligently discharge his firearm. This was half the problem. It turned out that the disassembly button fell right under the trigger finger of those shooter. The button was raised and the spring was very weak.
The other part of the problem was that when the support hand of the long fingered shooter hit the disassembly latch on the opposite side of the pistol . . . wooosh, off comes the slide.
On the second day of the testing a third Officer did the exact same thing. Also on the second day an Officer racked the slide and cut two of his finger.
The finding were immediately reported to Beretta. My understanding is that they have toughened the spring and on some models they have lowered the profile of the disassembly button, but they didn't move it.
I have looked at the .45 Cougars and the latch is a touch further forward, but that's due to the larger dimensions of the frame.
Hope that helps
John