The Smith & Wesson Model 637 Airweight is a single/double-action .38 Special +P revolver with a 5-round cylinder, 1.875-inch barrel, aluminum alloy frame with matte silver finish, stainless steel cylinder, and LG-305 Crimson Trace Lasergrips. It weighs 15.4 oz (0.96 lbs). 
 
Key Specifications: 

• Brand: Smith & Wesson 
• Model Name: Model 637 Airweight 
• Caliber: .38 Special +P 
• Action Type: Single/Double Action (SA/DA) 
• Capacity: 5 rounds 
• Barrel Length: 1.875 inches 
• Overall Length: 6.31 inches 
• Weight: 15.4 ounces (0.96 lbs) 
• Frame Material: Aluminum Alloy with Matte Silver Finish 
• Cylinder Finish: Stainless Steel 
• Sights: Integral Front Fixed Rear 
• Grip Type: LG-305 Lasergrip 
   
  Detailed Features: 
  The aluminum alloy frame keeps weight at 15.4 oz for all-day carry without fatigue. The exposed hammer enables single-action shooting for precision shots when time allows. Crimson Trace Lasergrips activate on a natural grip for fast target acquisition in low-light conditions. Integral front and fixed rear sights provide a reliable aiming reference when the laser is not needed. The stainless steel barrel adds corrosion resistance for daily carry. 
   
  Target Audience: 
  Concealed carry shooters and those who want a simple, reliable backup revolver. The grip size works across different hand sizes and the SA/DA trigger offers more flexibility than DAO-only options. 
   
  Usage Scenarios: 
  Daily carry for personal defense, particularly for shooters who want a revolver's mechanical simplicity in a lightweight package. Works well at the range for defensive practice with .38 Special or +P loads.

The Smith & Wesson Airweight Model 637 .38 Special with Lasergrip draws a familiar mix of praise and critique.

The light weight at 15.4 oz is the first thing owners praise. Carrying a revolver comfortably throughout the day is a genuine advantage and the 637 delivers on that. The compact 6.31-inch overall length reinforces the concealability that makes it a popular choice for pocket and IWB carry.

Reliability gets strong marks. Revolver owners consistently note fewer malfunction concerns compared to semi-automatics, and the 637 builds on S&W's long track record with the J-frame platform. The .38 Special caliber with +P option offers a reasonable balance of recoil control and stopping effectiveness.

The Lasergrip gets positive feedback from most owners for practical accuracy improvement in stress situations and for shooters who struggle to align traditional sights quickly. A minority find the laser activates too readily.

Recoil comes up as a real consideration. The lightweight frame transmits more felt recoil with +P loads than heavier revolvers, and extended practice sessions become noticeable. The double-action trigger pull is heavy out of the box and some owners have it smoothed. Five-round capacity remains a point of comparison against semi-automatics, though most buyers selecting a J-frame accept that tradeoff consciously.