Commissioned by Sturm Ruger as an upgrade to the SR line of pistols"" the LMS-RMSR provides a decisive targeting advantage in low light. This clever design offers superior integration with the sleek lines of the pistol frame and an integral Picatinny rail for the attachment of a tactical light. Advanced programming enables the operator to select from a steady or pulsed beam option for superior visibility and faster target identification. Offered by Ruger as a factory-equipped upgrade to the SR22"" this product is also aftermarket compatible with Ruger SR22"" SR9"" and SR40 pistols.