this one seems cool. LASERMAX
Laser Pistols Laser Sights Pistol With Laser Sights
Guide Rod Laser for Smith & Wesson M&P

but the activation is not as simple as the CRIMSONTRACE
Laser Sights For Smith and Wesson Pistols | Crimson Trace Laser Grips

both are too spendy for me... but good luck in your search!

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)))X~ silvercn ~X(((