The Standard Manufacturing S333 Thunderstruck is a .22 WMR (Winchester Magnum Rimfire) double-action-only revolver with an 8-round capacity and 1.3-inch barrel. It weighs 18 oz. (1.1 lbs) with a 7075 aircraft-grade aluminum frame. 
 

Key Specifications 

• UPC: 854581007015 
• Caliber: .22 WMR (Winchester Magnum Rimfire) 
• Action: Double Action Only (DAO) 
• Capacity: 8 rounds 
• Barrel Length: 1.3 inches 
• Weight: 18 oz (1.1 lbs) 
• Frame Material: 7075 Aircraft Grade Aluminum 
• Grip Type: Black Polymer with finger grooves 
• Finish Color: Black 
• Safety Features: Integral articulated trigger safety and transfer bars prevent the firing pin from reaching the primer unless the trigger is fully pressed 
   

Detailed Features 

 
The double-action-only mechanism eliminates manual hammer cocking -- each trigger pull fires and advances the cylinder. At 1.3 inches, the barrel is very short, suited to close-range carry use. The 7075 aluminum frame keeps weight at 18 oz., which is reasonable for all-day carry. The transfer bar safety system means the gun won't fire from a drop or impact. Polymer grip with finger grooves aids positive hand placement. 
 
The Thunderstruck fires two rounds per trigger pull due to its twin-barrel configuration, which makes the 8-round cylinder effectively 4 double-shots. 
 

Usage Scenarios 

 
The S333 is compact enough for pocket carry given its 18-oz. weight and short barrel. Backup firearm use is a common application -- it's small enough to disappear in a pocket holster. For outdoor use in areas with wildlife concerns, the .22 WMR offers more energy than .22 LR in a compact package. Range use with .22 WMR ammunition keeps costs lower than centerfire defensive calibers.

The Thunderstruck Gen II in .22 WMR generates practical feedback that reflects both its strengths and genuine limitations.

The lightweight aluminum frame and 8-round capacity are consistently praised. Owners find the gun genuinely easy to carry due to its weight, and getting 8 rounds from a compact revolver -- even across 4 double-fire trigger pulls -- is a positive differentiator from single-shot or lower-capacity options.

Price is a draw. The Thunderstruck is more affordable than many defensive revolvers, which makes it accessible.

The DAO trigger gets split feedback. Many owners accept it as simple and reliable; others find the pull heavier than they'd prefer, which some report affects accuracy. This is worth testing before committing to it as a primary carry gun.

Long-term durability concerns come up in some discussions. Owners who are generally satisfied with the build quality note a subset of users worry about sustained performance under heavy use.

Finish preferences are personal -- some like the black aluminum look, others prefer traditional blued or stainless finishes.