The Ruger LCRx in .357 Magnum with a 3" barrel is a double/single-action revolver weighing 21.30 oz. (1.3 lbs.) with a 7.5" overall length. It holds 5 rounds and has adjustable rear sights. 
 

Key Specifications: 

• Model Name: Ruger LCRx 
• Caliber: .357 MAG 
• Action Type: Double/Single Action (DA/SA) 
• Capacity: 5 Rounds 
• Barrel Length: 3 inches 
• Overall Length: 7.5 inches 
• Weight: 1.3 lbs (21.30 oz) 
• Sights: Pinned Ramp Front & Adjustable Black Blade Rear 
• Grip Material: Black Hogue Tamer Monogrip 
• Finish: Matte Black 
   

Detailed Features: 

The 3" barrel is longer than the standard LCRx snub-nose configuration, which provides improved velocity and a longer sight radius for better accuracy at range. The adjustable rear sight is a meaningful upgrade over the fixed U-notch on shorter models, allowing precise zero at various distances. The exposed hammer enables single-action fire for deliberate shots. 
 
At 21.30 oz., the 3" model is heavier than the 1.87" LCRx, which helps absorb .357 Magnum recoil during range sessions. The .357 chamber also accepts .38 Special and .38 Special +P. The Hogue Tamer Monogrip manages recoil and provides comfortable holding. 
 
This model occupies a middle ground: compact enough for carry, longer barrel for improved accuracy over the snub-nose versions.

The Ruger LCRx .357 Magnum 3" gets favorable feedback for offering better accuracy than the 1.87" versions while remaining carryable at 21.30 oz.

The adjustable rear sight is specifically noted as a practical improvement, allowing shooters to tune zero for their preferred defensive load. The exposed hammer enabling single-action fire is appreciated for range work and deliberate shooting situations.

Versatility with .357 Magnum and .38 Special is a consistent positive. Owners value the option to train with .38 Special before carrying hot .357 loads.

Recoil from .357 Magnum in a sub-1.5 lb. revolver is noticeable. Most users describe it as manageable but acknowledge that extended .357 practice sessions are tiring. Sights receive mixed marks: some find them effective, others suggest aftermarket options.

Overall the 3" LCRx .357 is considered a practical choice for carry or home defense where the slight extra length and weight are acceptable trade-offs for better accuracy and recoil management.