SMITH & WESSON MODEL 637 AIRWEIGHT (CHIEFS SPECIAL) Description
.38 S&W Spl.+P cal. (rated in 1997 for +P cal.), DA/SA, J-frame, 1 7/8 (current mfg.), 2 1/8 (PowerPort only, disc.), or 2 1/2 (mfg. 2010 only) in. stainless steel barrel and cylinder, 5 shot, alumunim alloy frame, external hammer, integral front and fixed rear sights, black synthetic, Uncle Mike's Boot (disc.), Crimson Trace Laser (new 2005), or pink (mfg. 2012-2020) grips, matte silver finish, 15 oz. 560 mfg. during 1991, reintroduced 1996.
There have been two engineering changes to this model.