Smith & Wesson Model 637, Performance Center, Double Action, Metal Frame Revolver, J-Frame, 38 Special+P, 1.88" Barrel, Aluminum Alloy, Matte Finish, Silver, Wood Grips, Fixed Sights, 5 Rounds 170349 • Double Action • Capacity: 5 • Finish: Glass Beaded Stainless Finish • Sights: Front: Serrated Ramp Rear: Fixed U-Notch • Barrel length: 1.875 • Overall length: 6.3125 • Performance Center Enhanced ActionExternal Hammer Enhanced Action J-Frame • Double / Single Action • Capacity: 5 • Finish: Matte Silver • Sights: Ramp Front Sight • Barrel length: 1 7/8" • Overall length: 6.3" • 15in Free-Float MLOK Rail/ Ambi Bolt Release