High Quality Content by WIKIPEDIA articles! The Ruger LCR is a compact .38 Special caliber revolver built by Ruger and announced in January 2009. The LCR acronym stands for `Lightweight Compact Revolver`. It incorporates several novel features such as a polymer grip and trigger housing, monolithic receiver, and constant force trigger. At 13.5 oz (380 g), the LCR is nearly 50% lighter than the stainless steel SP-101. The LCR operates in Double Action Only as the hammer is concealed within the frame of the gun and cannot be cocked prior to firing.