These stainless steel guide rods add weight to reduce muzzle flip and decrease follow up shot time. Also allows use of different spring rates to tune the pistol to your needs and handloads. Adds a little bling for those folks looking for that too. These are polished and assembled with loctite to your needs. Choose your desired spring rate and retainer color (polished stainless or blacked tool steel) and we'll put it together as requested. SR9 factory spring is 18lb and the SR40 factory spring is 22lb till December 2010, Dec 2010. We offer fully assembled units captured like factory in 15lb, 18lb, 20lb, 22lb, 24lb. This listing is for the Black Retainer Screw and 18lb spring rate. Fits SR9, SR40, and SR9E series of pistols. ***Will NOT fit SR9C and SR40C Pistols.
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