The Diamondback Sidekick is a DA/SA revolver chambered in .22 LR that ships with a second cylinder for .22 WMR. The swing-out cylinder design and convertible format make it useful for small game, pest control, and range training. 
 

Key Specifications 

• Brand: Diamondback 
• Model Name: Sidekick 
• Caliber: .22 LR / .22 WMR Convertible 
• Action: Double/Single Action (DA/SA) 
• Capacity: 9 Rounds 
• Barrel Length: 4.5 inches 
• Overall Length: 9.88 inches 
• Weight: 2 lbs (32.5 oz) 
• Sights: Blade Front / Integral Rear 
• Grip Material: Black Checkered Nylon 
• Finish: Black Cerakote (Barrel & Cylinder) 
• Condition: New in Box 
   

Detailed Features 

The two included cylinders let you switch between .22 LR and .22 WMR without needing a second firearm. The swing-out arm facilitates quick cylinder changes and reloads. At 4.5 inches, the barrel gives a reasonable sight radius while keeping overall length manageable at 9.88 inches. 
 
Barrel rifling is 1:16 RH with six grooves. The black checkered nylon grip keeps weight down at 2 lbs. Blade front sight and integral rear sight are standard for the platform. 
 
The 9-round cylinder gives more rounds per reload than a traditional six-shot configuration, which is useful during range sessions and small game hunting.

The Diamondback Sidekick generates mixed feedback. The dual-cylinder convertible format is consistently identified as the standout feature — the ability to switch between .22 LR and .22 WMR in a single revolver appeals to buyers who want flexibility without buying two guns.

The lightweight build and low recoil are noted positives, particularly for new shooters or anyone wanting a casual range gun. The 4.5-inch barrel and 9-round cylinder are generally considered well-proportioned for the intended use.

Criticisms are worth noting: some owners report reliability issues with certain ammunition types, including occasional jams or misfires. Trigger pull has been called heavy or inconsistent by a subset of buyers, which affects accuracy in double-action fire. Build quality concerns come up in comparisons with other revolvers in the price range.

Overall, buyers who go in with realistic expectations for an entry-level dual-caliber revolver tend to be satisfied. Those expecting tighter tolerances or a smoother trigger from the start may be disappointed.