The Crimson Trace Laser Grips I have had ever since I bought my M&P9 and they do not affect the holster at all they do however cover the Serial Number. After proper alignment they are great and can be turned off if required by a switch that is built in!
Yes they are pricy but you could do like I did and go on EBay and look for someone who ships to your country or possibly even lives there! These sights take some getting used to to be precise because of the involuntary movement which is amplified at different ranges, so in my case they were worth the $250 buck I paid for them (shipping included)!
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59,M&P9,40,40C,357,(2)45,G26
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