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You bought your Ruger LCP.  You love your Ruger LCP.  Now you want to pimp your Ruger LCP.  Why not start with a laser grip from Crimson Trace?  Here are the details on the Crimson Trace grip model LG-431 for the LCP:

The instinctive front-activation button means shooters grab the gun with their normal shooting grip and the laser will be instantly projected wherever the gun is aimed.  This "instinctive activation" provides immediate feedback and and gives shooters confidence their shots will hit their target.

Activation:	Instinctive Activation; Front
Material:	Rugged Hard Polymer
Design:	Ultra-compact 3.3mm Diode
User Adjustable:	Both Windage and Elevation
Warranty:	3 Years Complete
Beam Intensity:	5mw peak, 633nm, class IIIa laser. Maximum output that federal law and technology allow
Dot Size:	Approximately 0.5" diameter at 50 feet
Power Source:	Either two #357 silver oxide batteries or a single 1/3N 3 volt lithium battery

SOURCE:  http://www.crimsontrace.com/Home/Products/Ruger/LG431/tabid/361/Default.aspx