by B.B. Pelletier

Part 1
Part 2
Part 3

Today, I’ll look at the Beretta CX-4 Storm with a Walther PS22 dot sight mounted. Before we get to the report, let’s dispell an urban myth.

Urban myth
When I installed a new AirSource cartridge for this test, the cartridge leaked within a minute. This was a fast leak that could not be fixed with Crosman Pellgunoil. I ordered a replacement rifle from Pyramyd Air and was told by the sales manager that another customer told her that only Walther CO2 88-gram cartridges will work in this gun. That sounded too strange, so I decided to test it. Pyramyd Air supplied some promotional Walther cartridges they had, and I resolved to use them if the next gun leaked with a Crosman AirSource cartridge. But it didn’t.

The new gun held perfectly when the new AirSource was installed and was still holding several days later when I started shooting. There is no hint of the leaking that the customer mentioned. While there are visible differences in the threaded portions of the two cartridges held side by side, they both work in the same airguns. In retrospect, it would be a poor marketing maneuver for Umarex to build a gun that could take only one proprietary CO2 cartridge, because they cannot control all the markets in which their airguns are sold. So, this incompatibility is an urban myth.

Though the threaded portion looks somewhat different, the Crosman AirSource cartridges (right) fit the Beretta CX-4 perfectly. Walther 88-gram cartridge on left.

Walther PS22 electronic point sight
The Walther PS22 electronic point sight comes with the correct high-lift mount to clear the open sights on the CX-4. Though the profile from the side looks slender and almost willowy, this is a wide chunk of aluminum that will not flex. It also compliments the look of the gun nicely. The sight adjusts for windage and elevation as well as having 11 levels of brightness for the dot. The dimmer the dot, the smaller it appears, which means you can aim with greater precision. So, use the dot on the lowest level that works. And, don’t forget to turn it off (turn to zero on the dial) when you finish shooting.

Beefy cantilever sight base is rugged and good-looking.

I tried the gun with RWS Hobbys, which proved the most accurate in the first test, and also RWS Super Mags, which are 9.3-grain wadcutters. I found that the best accuracy came when the pellets were sealed deeply in the plastic carriers, so all the pellets were pushed deep with a thin metal probe.

I also discovered that this gun prefers to be fired rapidly. When I squeezed off five shots in less than 10 seconds, my groups improved noticeably over more deliberate aiming. That no doubt has something to do with the heavy trigger pull, which measures the same 8.5 lbs. on this new gun as the trigger on the first gun. At any rate, I scaled the distance back to 25 feet and shot many groups.

Slow, deliberate shooting gave open groups at 25 feet. RWS Super Mags. These 10-meter rifle target bulls are smaller than the 50-foot slow-fire rimfire targets I used for the last accuracy test.

Shooting rapid-fire tightened the groups. Five RWS Super Mags.

I am intrigued with this little carbine, so I will scope it and return for a final look.